I've installed it on the iPad now, which makes drawing so much easier. I've still only got 5 games running at the minute. Looking on Facebook, about 80% of my friends have it.
The big problem I found with it on the iPhone is that it kills the battery. I was having to charge mine every 12 hours as the game was constantly in use when notifications were turned on. I've not enabled them on the iPad, so it's not using the batter when they game isn't open,
