i bought it awhile back when it cost $4 and thought it was well worth it.
When i first bought the game i hated it because it was way too hard to control the ball using the accelerometer, but then someone tipped me off that you can change the settings to touch controls which vastly improved the gameplay.
Alot of the later levels are really complicated and challenging. My only complaint is that I wish there were more levels to the game. At $1, its a steal, you should definately try it out