Hi bigkgolfer,
Welcome to the site 
I would be very cautious about using other people’s experiences or reviews on a mattress (either positive or negative) 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 and in many cases they can be more misleading than helpful because a mattress that would be a perfect choice for one person or even a group of people may be completely unsuitable for someone else to sleep on (see post #13 here).
Having said that … a mattress that is in the “medium firm” range would generally work well for most stomach sleepers because stomach sleepers generally need firmer mattresses than side or back sleepers to help prevent the pelvis from sinking down too far and sleeping in a swayback position.
Tuft & Needle is one of the recommended members of this site (which is by invitation only) which is the reason for the discount and I’m not aware of other discounts that they offer.
There is also more about the “simplified choice” mattresses (including Tuft & Needle) in posts #1 and #2 here that may be helpful as well.
Phoenix