Hi sonicfox,
Welcome to the Mattress Forum! 
Just in case you haven’t read it yet … the first place to start your research is the mattress shopping tutorial here which includes all the basic information, steps, and guidelines that can help you make the best possible choice … and perhaps more importantly help you know how and why to avoid the worst ones.
Two of the most important links in the tutorial that I would especially make sure you’ve read are post #2 here which has more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of “comfort” and PPP (Posture and alignment, Pressure relief, and Personal preferences) that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists (based on all the parts of your personal value equation that are most important to you).
As you stated you want to shop online, the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart and who can help “talk you through” the specifics of their mattresses and the properties and “feel” of the materials they are using (fast or slow response, resilience, firmness etc.) and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked or other mattresses you are considering that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs, options, and firmness levels to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with) than anyone else.
Use the experience and expertise of the members listed in post #21 here who are all very experienced and knowledgeable and specialize in providing the type of help and guidance on the phone that can help you make good choices. There are a wide range of latex and memory foam and other options included in the choices there and I believe that all of them compete well with the best in the industry in terms of their quality, value, service, and transparency. Their detailed knowledge of their mattresses and how they fit with different body types and sleeping positions along with your feedback from local testing, a customer base of many people that they can use as reference points, and any exchange, return, or any options they have available to customize a mattress after a purchase can help lower the risk of an online purchase. These online retailers or manufacturers can also be a good “value reference” for local purchases to make sure that if you are paying a “premium” for a local purchase (in exchange for the kind of “in person” guidance, service, and value that comes with dealing with a local retailer that can help you make more “accurate” choices that you have tested in person) is not too high.
Post #2 here and this topic have more about the pros and cons of a local vs an online purchase.
I can’t tell if you are asking questions about the componentry in this product, or being promotional, but since this is a newer mattress that hasn’t yet been discussed on the forum I’ll do my best to provide some information.
The Performasleep website provides no meaningful information about the foam in their mattress. The top 2" layer is a gel infused polyfoam called CopperCool. Beneath that is a 2" layer of Enersorb memory foam. Beneath that is a 7" base layer of polyfoam.
For the top CopperCool layer of polyfoam, there have been healing claims made about copper for years. Here is an article that discusses that. Most of the “health benefit” claims of copper are anecdotal and often made by athletes, but in the past few years companies making claims of true health benefits or increases in performance have been fined by the FTC.
Copper is encapsulated and currently used in some foams, more for the small additional amount of heat transfer that it can provide. Copper itself is a very thermal conductive material so it would make sense that copper fiber infused foam (or other types of more advanced thermally conductive materials such as graphite) would be a little more effective than the gel that is more commonly used but it would also depend on the amount of copper that was in the foam. The copper gel is relatively new but if you know the density of the foam layers then it really doesn’t matter how new it is anyway since the density of the foam is the single biggest factor that will affect the durability and useful life of the mattress.
Enersorb foam The second layer of is a newer type of foam that has the properties of memory foam (getting softer as it gets warmer), but it has more resiliency than a traditional memory foam.
In order to assess whether a mattress was a “good quality”, you need to find out the information listed here so you can compare the quality of the materials and components to the durability guidelines here to make sure there are no lower quality materials or weak links in a mattress that would be a cause for concern relative to the durability and useful life of a mattress before making any purchase. Your best source for this information would be a phone call to Performasleep. I’ll be interested to learn if you are able gather that information.
While other people’s comments about the knowledge and service of a particular business can certainly be very helpful … I would always keep in mind that you are the only one that can feel what you feel on a mattress and I would be cautious about using anyone else’s suggestions, experiences or reviews on a specific mattress (either positive or negative) or review sites in general as a reliable source of information or guidance about how you will feel on the same mattress or how suitable or how durable a mattress may be for you. In many if not most cases they can be more misleading than helpful because a mattress that would be a perfect choice for one person or even a larger group of people in terms of “comfort”, firmness, and PPP may be completely unsuitable for someone else to sleep on (even if they are in a similar weight range). In other words … reviews or other people’s experiences in general won’t tell you much if anything about the suitability, quality, durability, or “value” of a mattress for any particular person (see post #13 here).
When you can’t test a mattress in person then the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart and who can help “talk you through” the specifics of their mattresses and the properties and “feel” of the materials they are using (fast or slow response, resilience, firmness etc.) and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked or other mattresses you are considering that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs and firmness levels to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with) than anyone else.
I look forward to finding out if you’re able to gather more information about the componentry within this mattress.
Phoenix