Ahg yearlings, hard to judge.....
And I'm really not willing to say one way or another about the legs. He needs a trim, he's a baby and may have stood up funny for the pictures, and he's a baby and might still change a bit. But unfortunately the legs are one of the most important things about his future, especially since he may be working hard and jumping. If you don't get a better feeling about the front legs in person, I think I would pass just on that alone...they take a lot of pounding on every landing.
Also, I don't really see the rest of him as being spectacular. Nice short back/long underline, good shoulder slope and wither. However, as lovely as that neck looks at this stage, as he grows up to mature, that neck is going to be short and thick, the throatlatch very thick. And while I think I like his hind leg angles fine right now, I'm not a fan of the hip...short and too steep for me.
But it's only 20 minutes, go and see for sure. Pictures can be deceiving.