Hi Spud987,
If you have pre-existing back issues … I would be very careful in buying a memory foam mattress you haven’t personally tried or using memory foam layers (in combination with other softer layers) that were too thick and/or too thin for your particular weight, body shape, and sleeping positions. Memory foam can be very tricky to get right with back issues and can lead to some significant issues if you don’t.
Classic Brands makes some good value choices but they also make some choices that are not as good.
Some guidelines that should help you avoid most of the traps and pitfalls of mattress shopping are here.
Scanning the overviews in the mattresses section of the website that should help you with some basic mattress information that should help you ask better questions when you are mattress shopping.
Post #10 here will give you a few guidelines of what to avoid in a memory foam mattress.
In general … local factory direct manufacturers or retailers who have a direct relationship with smaller or local manufacturers are the best place to do your shopping as the odds are much higher that you will get accurate information about what is in your mattress and they will also have the knowledge to tell you what this means in real terms (they will focus more on educating you about mattresses than telling you stories to make the sale). Knowing about where to do your mattress shopping is one of the most important parts of mattress shopping and is half the battle. This makes the second half of the battle which is finding someone with the knowledge and skills to help you choose a mattress that meets your unique and specific needs and preferences and has real value (higher quality materials that are more durable) much easier.
The Solstice that you linked to uses 3 lb memory foam which would be reason enough to avoid it all by itself.
Hope this helps … and if you let me know the city you live in I’d be happy to see if I know of any better quality outlets near you.
Phoenix