Yay, you won't regret it!!

I'm the same as JwithJ - I only wash them the once before using, but I found, especially with the cushie tushies, that they get more absorbent the more they are washed, so I'd change him frequently.

DD is a big wetter, and we have her mainly in Bumgenius with no issues on leakage. Though I think as she's getting older ones with snap closing as opposed to velcro might be better! (Harder for little fingers to undo)

Good luck!