I rode a buddy's KTM144 right after he bought it 2 years ago at a large outdoor fast track, it was just a open ride but there was a few decent riders there, and Im a Expert/Pro level rider and I weighed about 260 then and after a lap or two I was tearing that thing up jumping everything going wide open on it and blowing by everyone there I was having the most fun I had had in a long time on that thing and the suspension was all messed up on it way too much sag, etc.
If I had the money to buy a new bike, I would buy one, have the suspension revalved for me, and be a happy man, I honestly jumped eveyrthing almost just as easy on that bike as I could on my 250 2-stroke, I couldnt beleive how hard it pulled with my fat ass on it.
Get one youll be a happy man