zbovka As for the men's side, well they aren't exactly popular and looking at the design potential issues, I can clearly see why. They are probably attempting to remedy this shortcoming by pushing into the gay adult video market at least according to their website.
Not much is known about long term wear (in fact I've never read a single story about long term wear)
Before BehindBarz came along, Carrara was pretty much the #1 full belt design for the gay community. From my understanding, there are many somewhat long-term wearers in that group.
Most of the florentine-style designs (William Jones, Access Denied, Tollyboy, Neosteel, My-Steel etc.) are rather feminine, so they are most popular with women and crossdressers. Carrara is one of the few that does a more masculine belt design, and they are generally treated as top-of-the-line belts for lifestyle wearers.