Thanks for the feedback everyone. As I mentioned, I have used a few in my 20D. I went ahead and purchased a couple from Amazon and got them last week. I purchased the grip for my 60D at the same time. I was mainly concerned about the registration of the batteries like the 60D does, but decided that wasn't such a big deal over price and performance. I was happy to to see the registration tab show the batteries available for registration after I put them into the grip, attaching it, and turning on the camera.
I spent Saturday morning shooting a lot of shots and taking HD video and that barely put a dent in the charge of both batteries.