I have a WOW. I LOVE the idea of them, I really do, but the fitting is so, SO important that sometimes this gets in the way of the saddle itself. My mare certainly goes well with hers, I rode her in a normal saddle today and I could tell the difference and she certainly wasn't moving as well as she usually does. They really are a personal choice - some people dispise them, some horses hate them, so have a go and see how you go.
Thats interesting to hear about the Wintec as where we bought our Andalusian from they all used wintecs on the other horses (which were all PRE's too). I think I'll try and arrange for that saddle fitter to come out so I can try the WOW's and see for myself.
Julia fitted mine too and is back out on friday for a refit! My boy has only had his saddle 7 weeks (one of which i was on holiday) and he has filled out incredibly!! I really like mine, although had had to fiddle a bit with the knee rolls..