I switched from an iPhone 4 to the Note about six weeks ago I think. I couldn't go back. I love the screen size the most, but having an android phone is like having a jail broken iPhone - battery life isn't quite as good, some things don't work quite as smoothly or perfectly, but in the end you can do SO MUCH more with it that's its absolutely worth it.
Edit: occasionally there would be lag when I first got my Note, but that was from the Power Save mode that must have been running by default. My battery life is only a bit worse than my iPhone 4 ran on ios 5... battery like was great on ios 4 but it went downhill some after 5 came out.