Sure it's a best bang for the bucks ! No other such bargain on the market, I immediately pre-ordered the 1S version with HR sensor for a measly 21$.
( I'll probably regret white LEDs only on the newer version for notification purposes)
Basically I use it for sleep tracking and notifications; being the former pretty accurate, while the latter require a modded app, easily available.
I can't rate advanced fitness related features because I routinely use other devices for my daily activities; anyway, step counting seems to be overly optimistic.
The strap itself wears out quickly; after a couple of months the buckle breaks the slim ring the other side of the strap, so you'd better watch out for possible device loss if it gets unbuckled.
But, at 15$ you sure can't complain about anything; it has an exceptional battery, and I highly recommend it.
