I personally do not like Wintecs, they seem cool and convenient because of the interchangeable tree, but the truth is you’re better off spending a bit more money and getting a better saddle. Most saddles are flocked (filled) with wool or synthetic wool stuffing. That is nice because you(well not you, but your saddle fitter) can add flocking or remove it, and a saddle should technically be reflocked at least once a year. Wintecs are filled with “air bags” which are said to give your horse a more comfortable ride, but it’s not true. They’re like a balloon, when it’s hot out, they expand, and when it’s cold out, they shrink. So your saddle could have a different fit every day according to the weather! The airbags are also prone to popping, and they aren’t replaceable, so your saddle is basically ruined after that, and it’s hard to tell without professional help whether or not they have popped. If you want something like a Wintec, go for a Thorowgood, they’re synthetic like Wintecs, and also have changeable gullets, but they’re flocked with synthetic wool, and made of better quality materials.
They are a bit pricier than Wintec, but you get your money’s worth, because the saddle will last much longer and you’ll probably be happier with it. I don’t think they have the prices online, but a lot of people sell them used in the $400-1000 range, depending on how old it is, and condition.
Just my two cents!