With the exception of the price and only 30 days training, he deffinitely looks like he'd make a fine HUS horse.. Yeah he'd probably be ok for small jumps, but I wouldn't push it on jumping with him. He kinda looks like the HUS Quarter Horses I usually see though. Maybe you should take him for a test run/ride?
He appears camped out but it could be the way he's standing. Based on his hock angles, he's probably fine. Where are his feet though!!! Tiny little things. No foot, no horse. Also neck ties in low and he is down hill. For $10K, eh.
Nice horse. Not "posty" . Not sickle hocked not over angled either .
He does not appear downhill when looking from withers to butt.
If you are doing hunter under saddle, what heights are jumping ? And has he jumped ? Or are you just doing flat work?
A pic of him unsaddled would be nice.