I personally love it. They're starting to get a pretty big offering as well.
Today's limits for MLB moneylines and runlines was 2.5 BTC it looks like. Usually their limits for totals are about half as much. Limits for opening day NFL right now is 0.6 BTC, but I'm assuming that's just because it's so early and they don't have a solid line yet
I've heard no complaints about rejecting winning players, and haven't had any issues myself