I'm not an Ohio State fan so haven't seen a ton of him, but I think I can give a decent assessment. As of right now most people feel he is the number one corner prospect for next years draft, but obviously a lot can change between now and the draft. Had he come out this past draft there was a good chance he would have been the first corner taken and possibly top ten overall. He is 6'1 with 4.3 speed, so you know that he has all the measureables to be a shutdown corner in the NFL. He has seven interceptions the past two seasons, which is impressive considering QB's don't test him a whole lot, and is a very solid tackler.
I'd say he's a better prospect than Whitner, and certainly much better than Youbouty. Best case scenario is he could become another Antoine Winfield or Shawn Springs, two fellow Buckeyes. Certainly number one corner material.