I love my Wintec...I also have a Bates and I use the wintec on trail/when I ride in crappy weather/when I let other people ride so I can keep the Bates in good condition. I have the VSD all purpose (It has a longer and more cut back flap than the regular all purpose).
The only problem I have is that after long periods it starts to hurt my butt. The material doesn't really "break in" per se, so the flaps are always pretty stiff too, and can be slippery when they get wet. Definitely more slippery than leather, even dry.
Also, the twist is a lot wider than I'm used to, even though that might just be because I'm used to riding in a close contact. I'm pretty sure the Wintec and Bates are made on the same tree though, so the twist should be narrower in the close contact.
I have a draft cross with low withers and a wide back, and the changeable gullet has saved me from having to buy about 4 different new saddles. When I got him he was in the medium, and now he's all the way up to the wide.
Haha it might have seemed that I had a lot of negatives about it, but when I couldn't afford another expensive saddle, I wouldn't have chosen anything other than the Wintec. I'd rather have a few cosmetic things that bother me than have to worry about whether the saddle was going to fall apart underneath me. Mine has gone in the ocean, gotten hung up on trees, been snowed and rained on, left out in the sun for days (forgot it on a fence when I went on a hunt) and it still looks like new, and is in physically great condition.
High quality for a low price! (Rare to impossible to find otherwise without sacrificing A THING!...except leather haha)