I don't like that the vibration is weaker then the s2. I wouldn't trust Fit2 to wake me up from deep slumber.
I do love how comfortable it is. I've had the fitbit hr in the past and never wore it much because the heart rate monitor would dig into my wrist. The s2 isn't even this comfortable, s2 always manages to shift in a position that placed the screen part over that wrist bone that sticks out a little (maybe i have bony wrists lol).
going on 21hrs of wear time and it hasn't fallen off or un-clipped. Today i volunteered at my kids Pre-k class, took multiple naps, tried on a few outfits never fell off. weird that it doesn't have that loop like the s2. battery life now is at 66% have it connected via bluetooth with screen at 7, vibration on, wake up gesture on.
I dont use the pedometer. I weight train. My main things are the water intake, sleep monitor, and heart rate monitor.
Taken a few naps today someone mentioned it in another post takes about an hour after waking up for updates, and sure enough an hour after waking up i get the alert. After that i look at s health and it shows how long i was motionless, restless, how long i was a sleep and calories burned. pretty cool.
Wore the fit2 on one arm and the s2 on the other and ran on the treadmill that has a heart rate monitor on it. the fit2 and s2 showed the same rate the treadmill was 3 beats lower.