I think Guitar Rock Tour will drain more battery than Tap Tap Revenge. Mainly because of it's awesome graphic, sound and loading time.

BTW here's my personal app that I used/played most for the month, sorted in no particular order:

Paid
Other than Games
1. AppSniper (The first app and thing I do everyday I woke up. Great to check for any new app and price drop)
2. iDiary (I make my diary entry almost everyday with this before sleep)
3. iVaultPro (Good for cataloging my every stuff, I like cataloging everything)
4. Computer Terms

Games
1. Buggled
2. MadShells (Test your eye movement and concentration, so far I can only make it till Level 27)
3. Amateur Surgeon (Nice graphic, much more easier than Trauma Center)
4. FieldRunners
5. Trace
6. touchPhysics
7. Tangram Puzzle Pro
8. Labyrinth (My favorite)
9. Frenzic
10. Loops of Zen
11. Flick Bowling (Graphic is much better than other type of bowling game, including Midnight Bowling)
12. Flick Fishing
13. Crazy Tank
14. Crash Bandicoot Nitro Kart 3D Racing (Lags in some scene but still playable)

Just Purchased
1. Snail Mail (Great cell-shading sprite)
2. Sneezies (Cute sneezing sound)
3. TouchGrind
4. Flight of the Hamster
5. UNO
6. KamiCrazy (Nice puzzle game)

*I played a lot

This post has been edited by D.Sync: Dec 25 2008, 07:14 PM

Yep, I just purchased it and didn't regret for doing so. So far no lag at all and game play is pretty smooth.

I just notice some bugs in Guitar Rock Tour. In some songs, even though I tap the right key at the right time, the system won't recognize my touch. Thus, make me can't do a full combo for a song, even NORMAL one!