Not sure about this horse?

So Iam horse shopping! And im looking for a hunter. My instructor has this horse that she thinks will be a perfect match for me. But hes kinda intimidating! Hes a chestnut warmblood and thoroughbred mix. He is 17.2hh tall and Im use to riding 15.1hh tall. But he could take me from 2ft.6 to the derbies and maybe just maybe.(Maclay I hope). But he is a wee bit green. And when he has his bad days he is fricken scary! Hes broken his owners leg and cracked someones rib! But he seems really awesome and fun! What do you guys think? I think I should just tray riding him and see how it goes. Because hes already boarded at my barn right now so it wouldnt be that hard to try him out.