He seems to appear very athletic and english "type". I don't know much about the Grand Prix specifically, but with more training I'm sure he could go as far as you wish to take him. His trot looks a little bouncy..but maybe it's just the video? In the jumping videos he seems to second guess his jumps (Burggraaf x Haarlem...06 01 2011
). Not sure if something in the audience is spooking him, or maybe he's timid in the show ring? (Could be dangerous in the future.) Just a random thought ;)
Overall-very nice looking horse.