I really like him. Very nice looking horse and no obvious issues or defaults. However what you want to do with him? I'm not so sure he'll be a good candidate for cutting or barrels being so big. I may be wrong though....
I would barrel race him, and I know lots of big barrel horses so its not a problem for me. The owner says he is extemly fast and athletic, and turns like a little horse. My barrel mentors best horse was 16.1 and she set arena records on him, so his size is just perfect for me. Thanks everyone!! I will definitely go and look at him if duchess sells.
He's a solid horse, built a little downhill and a fairly straight shoulder and a tiny bit post legged and out behind. His gaits might be a little rough and I'd imagine his canter wouldn't be the best, but worth a look if you are looking for a quiet ranch horse. His left knee just looks funny because of the angle and blur of that one picture, if you look closely it's normal.
And hun, you ain't seen big until you've ridden 18hh horses :P 16.1hh is small compared! Judging from the guy's height I'd say they're fibbing slightly on his size. If you got a stick by him I'm pretty sure he'd be closer to 16.3hh.
Good luck! Good solid and quiet horses are getting fewer and farther between these days.