He looks relativly nice. The rider doesn't make the best example of an experienced rider. But he must be a forgiving horse if he can take the unsteady hands and getting tickled by spurs every step. But since your friend is planning on jumping I would request to see him over fences. And MAKE SURE you ride him before buying. Walk, trot, canter, and a small fence. If you aren't comfurtable with doing all that, you might want to do a walk/trot ride, see how he tolerates going at a slower pace. Also, you might want to request your trainer ride him aswell. If you are inexperienced she might be able to see or feel un-soundness. Or you could ask to have a lesson on him. Go through what you would usually do and see how he acts.