I have owned a 500 with CAIR for about 4 years and every horse I have used it on went quite well in it. . . including two very sensitive backed horses. My equine chiro is quite a fan of WINTEC saddles. It is his number one saddle choice for a variety of disciplines.
While I do covet a fancy high end dressage saddle from time to time, my Wintec 500 gets the job done, my horses all seem to like it, and it is a breeze to take care of.
I put regular leathers on mine instead of using the Wintec"leathers". You can’t see any difference.
When it is new it will squeak. Don’t dispair. It goes away.