I just purchased a Prestige Grand Prix, 34 cm tree and 17" seat, long flap. I had my horse fit using Stubbens and a Nona Garson Prestige and this is the size they decided I needed.
I rode in it and it felt wonderful. My horse didn't show any signs of discomfort. The sweat marks were evenly distributed on her back (no dry spots). The saddle didn't compromise her shoulder movement, either. The angle of points are also parallel.
I've uploaded a few pics to get opinions on the fit. This was a big purchase for me ... I'm getting married in less than a month and I sold my HDR A/O due to the fact I needed a better fitting saddle for both me and my horse. I want to be sure that it fits properly before I lose the opportunity to send it back.
The three people that looked at it said it looked great and fit her nicely. I haven't gotten a professional saddle fitter to look at it - the one I did ask was extremely negative about it because it wasn't her brand she sold... Tried not to take that one to heart, but it did make me worry.