ok, I'm no expert but I've been looking into this lately as I'm trying to find a saddle to fit my gelding. To my eye, this saddle looks like it doesn't have a wide enough gullet (looking from the back, it looks like the panels might sit too close to or on top of his spine, for instance when he's bending around a turn, which wouldn't be good).
Also, it looks like it may be too narrow a tree width-- it kind of looks like it sits up too high on his shoulders from the front view. When you've tightened the girth, can you get a hand in on the side of his withers or does it feel like it might be pinching his shoulders?
I could be wrong as I'm not very experienced in this. Once you decide whether it fits your horse, you should ride in it and see if it fits you-- one saddle I rode in gave me a back ache because it tilted my pelvis forward too much. Make sure the saddle allows you to sit correctly on your pelvis and seat bones with legs hanging with ear/hip/heel alignment.
Hope that helps. Good luck.