I really can't say as I just stumbled on their site today for the first time. Some of the DKC remixes on there I’ve heard are pretty decent, but then there is a lot of other stuff that seems really well done.
It's a monthly contest of video game remixes, the main difference with ocremix is that the main instrument must be LIVE, and not a synth. Some of the stuff in there is just plain awesome.
Here are a few treats, all three are HEAVILY recommended: