I like the horse as well. He is definitely an athlete, and is keen and brave. 20 or 30 year old me would have loved him.
His form really isn’t a concern at all. His front end is fine, even quite good, when he gets to the fence in balance at an appropriate spot.
Watching your video, I think you did an excellent job on him. But I want you to notice the head shaking around the corners, and how heavy he got in your hands after the second fence. Imagine if there was a third fence a related distance from the second. Could you have reestablished rhythm and balance in time? And then landed from the third fence in balance? THAT’S what the pro was so tactful about managing, riding from seat and weight rather than hand.
Again, you might buy this horse and have a fabulous time learning on him. You might get this horse and have to have a pro tune him up for you frequently and still have a good time and a learning experience. Or you could end up with a bad experience or a horse you don’t feel confident about riding.
It’s a very nice horse. You are a very capable rider. It doesn’t mean this is a match.
ETA: If you were my client (I’m going to make some assumptions, sorry.) with a lot of experience in the hunter ring, but not much or none in the jumper ring, this is not the horse I would want for you. I would want a horse that was stepping down, a been there/done that type, who would be forgiving of mistakes, but could be competitive at the 1.1 and 1.2 meter classes. If you didn’t have the budget for THAT horse and had to buy a young horse to bring along, this horse would tempt me, but I wouldn’t bite. I’d want something a little less nervy and a little less forward; a little more accepting of the hand.
If you buy the horse anyway, because he’s lovely, I’ll cheer for you every step of the way and demand photos.
But one last caveat - if a professional familiar with the market tells you this horse is a little or a lot too cheap for something with his athletic ability, run, don’t walk, away.