Hi runs100s,
Welcome to the Mattress Forum! 
Regarding other people’s reviews, I’ll first provide for you my “standard” disclaimer. 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).
As far as The Mattress Factory goes, they are a site member here, which as I think you know means that I think highly of them, their advice and their componentry. If you do decide to purchase from them, be sure to ask for your Mattress Underground discount. The latex they use is a high quality material (as is most latex), and they are the manufacturer of my mattress, with which I am still very happy. They certainly would be worthy of a visit as you are so close.
Phoenix