I think he is a very intriguing prospect. I am not sure he can play SF, but I think he projects to be a Carl Landry or Ryan Gomes type offensive PF off the bench. I think a couple weeks ago, he would have gone in the top 20, but with some mediocre measurements (his standing reach was only 8'7" I believe), I think he is a prime candidate to slide as teams talk themselves out of his strengths, and focus on the fact that he is a tweener. I don't think this kid is going to be a star, but I think he will be a very solid NBA player, and could help a team right away.
Particularly if they are not sold on any of the high risk/high reward guys, Harris could be a very good option.