I have a couple of the 1 1/2" Wilderness belts, one three-stitch and one Combat Shooter's Model with the polymer insert. I agree that they are a lot of belt for the money and also are good "beater" belts for times when you might damage a nice leather belt. I think they would be a good product to stock.
The three stitch is plenty rigid enough for carry. The extra stiffness of the CSM is a liability in my opinion. It is too stiff to easily thread through the slots and loop of a pancake style mag/flashlight pouch. Consequently, I never use my CSM belt when carrying, which seems bass-ackwards. The three stitch model is flexible enough, yet is sufficiently rigid to support a stainless 1911.
The only downside I see is that my holster tends to gradually slide back from my preferred 3:00 position to 3:30-4:00. I haven't had this problem with thicker leather belts. That might just be a problem with my phsique (or lack thereof). YMMV.
The Wilderness belt is more adjustable than a standard belt that limits you to using the various holes. That comes in handy after a big meal of turkey and all the fixin's. On the other hand, it doesn't give you the feedback that you're putting on pounds like a regular belt does when the normal hole gets a little snug.
As an aside, I think it speaks well of Gary's integrity that he posts a positive evaluation of a competitor's product. I doesn't surprise me in the least, but I thought I'd point that out.