I like Sims a lot. I find him a lot of fun to watch. That being said, very few RB's from that type of spread offense translate real well to the NFL. I think it has a lot to do with the fact that they are running through huge holes a lot in the college game because defenses are so overly focused on the passing game. When they get to the next level the holes they are used to seeing do not exist, and what they are given closes up a lot faster.
From a stature/running style standpoint, he reminds me of Pierre Thomas a bit.