He has been a VERY pleasant surprise. He was brought up for what would have been only a week or so when DeJean went down, but he's pitched his way into a long term commitment (I see no way he goes down now, and perhaps this whole season). He throws a nice slider, a fastball that he changes speeds with at will, and he throws another breaking pitch, believe its a change up.
I think the reason he isn't being talked about is he's just a middle reliever. Not even a set up man. He was originally a starter, and someday he may revert back to that role. But for now, he's a solid middle reliever. Fantasy wise, he's a decent pickup in deeper leagues with lots of pitching spots.