I was a little leary of buying any smart watch off Groupon. A lot of the reviews were scary. This one had the best rating/reviews for the price...and it is WELL worth it. I've been using it for the last 3 days and the battery is still 3/4's of the way charged. It syncs to my phone and does everything it says it does in the description. I will say, the only downfall is, in my opinion the sleep tracker may be off a bit. For the last couple days it says I go to bed at 11 something when I know I go earlier and once I sinc the watch to the phone is wake up time. As far as deep sleep and light sleep, so far it seems accurate because I haven't been waking up and the watch says that too. Lol. The watch isn't too bulky and is very secure on my wrist. For 27.00 it is well worth the price!