Yup, it's really really great, very comfortable and without the usual shortcomings with either the Dpad or sticks. Love it.
I also love dual screen gaming so much more than I thought I would, it took some time getting used to but once I did it felt like it was always supposed to be this way.
The battery life is crap though... Nintendo might think you should take a break every hour anyway but it's still crap. Hopefully they solve it later on somehow when they start selling controllers separately, GamePad+ with 5-6 hours battery life.
But being a parent has still saved me from seeing the battery go completely out so it's not a disaster for me petsonally, 3 hours is probably my longest gaming sessions so far, and I always rest the GamePad in the charging cradle after use.
Btw, off-TV gaming might be one of the best inventions yet in gaming, at first I thought it was fun but kind of useless but it only took one single situation when I really needed to get how awesome it really is.