Hi PackerbackerCH,
Welcome to the Mattress Forum! 
A firmer surface comfort, or something not overly plush, using more resilient materials, can work well for someone who sleeps upon their side but prefers a bit of a “firmer” product and needs to be able to more easily reposition.
Yes, using other people’s review or opinions is the least accurate manner in which to select a mattress, and I would suggest avoid them altogether, as it contributes more to confusion than educations. 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 (Posture and alignment, Pressure relief, and your own Personal preferences) 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).
Yes, they do use good quality componentry and are well-respected within the industry. And as you are probably aware, they are a site member here, which means that I think highly of them.
Again, I would not use other’s results or opinions on a product as any sort of reliable indicator as what might be appropriate for you. And you’ll also note that many people opined after a few weeks how the "false firmness’ of the new BME model was reduced.
Latex and the TitanFlex high performance polyfoam are both quite resilient materials, making it easier for repositioning, but as you’ve never tried such materials it would be important for you to become completely familiar with the return/exchange polices of any manufacturer that you are considering. No matter how well a product may be described, I know it is difficult to lie down upon your computer monitor and try it out! 
I’d certainly suggest another phone conversation should you decide to purchase this product, just to confirm your desires and needs. For your mass and just the few things you’ve mentioned in your post about your preferences, the medium BME would seem to be a logical choice.
Most modern mattresses these days are one sided, so rotating would be what you’d most need to worry about, versus flipping.
There are some comments about edge support with latex or other foam mattresses in post #2 here and the posts it links to. Most foam mattresses using a firmer polyfoam core (like the BME) don’t need a specific edge reinforcement system, as the polyfoam core can be quite similar in firmness to some of the foam encasement structures in use by innerspring products. But in general, the edge in these foam products may not feel quite as hard as some of the “traditional” offerings out there. It all depends upon the type of system you are used to.
Brooklyn Bedding recommends any type of support system that provides minimal to no flex.
Phoenix