I had two Wintec AP saddles. I have had ONE horse that they fit well, all the rest they just didn't fit at all. I found my 500APs comfortable, but yes, hard, and they didn't put me in the best position ever. I jumped up to about 3' in a Wintec 500 AP.
Now I have a Wintec 500CC, and two dressage saddles, one of which is basically a cheap copy of the Wintec Isabell. I love my CC, I HATE my synthetic dressage saddle, and I bought a beautiful leather dressage saddle for $500 which is just magic. Second hand of course but absolutely fantastic.
I believe that an AP saddle is only good for people who don't know what they want to do, or can't afford two saddles. They are not good for flatwork and they are not good for jumping. Jack of all trades, master of none. Since I specialized I have been able to get much better dressage work out of my horse, and my jumping work is much improved. I jump higher and with a lot more confidence, and my position is better. Not perfect... but better. My horse is an eventer, and my young horse is intended to be one, so I do need both a dressage and a jumping saddle.
I doubt a W500 AP will fit an Arab, by the way. They are more designed to fit Thoroughbreds. I have an Anglo and a TB, and the W500CC fits both, with a change of plate in between [the Anglo is a wide, the TB is medium to medium-narrow], but the W500AP doesn't fit either of them.
If you're keeping your horse forever, I would invest in a good quality leather saddle, and don't be turned off by leather that might be a little bit stiff. Slightly stiff leather will soften with use, and will last FOREVER. My leather saddle could be anywhere from 10 to 30 years old and looks like it's brand new. I need to darken it back up [it has faded some, black saddle which has gone a bit grey] but once that's done nobody would ever guess it was an older saddle.