I bought this on a whim and as a ~$35 item its not a big deal.
I didnt like the std. rubber strap so I bought a $7.50 metal and rubber strapped fixture frame so it looks bit less like a sport band.
Who doesnt like rose gold?
Anyway I had a slightly frustrating time getting it to go. You NEED to first sync it with the MiFit app as it needs to update the firmware. Also not happy you need to reg. an account with xiaomi but saying that the setup is fairly easy once only give you need to tell it what your body weight it and your height and other stuff.
You can conceivably use this as your watch as it has a newly added function of day and date as well with the time.
Battery life is excellent. I'm at 80% and I expect I will charge again at Xmas.
Ok now some bad stuff. The way its set up is that if counts all your steps in a 24hr cycle.
Now the ideal is 10,000 steps in a day. At best I got it to 8,000 and thats on a bad day at work where I was up and down the stairs and was physical.
I typically do 2,000 - 4,000 at best.
This is the life of a network engineer I guess.
It does have compatibility with Android and even Windows Phone apps so you can sort of tell your phone you're doing a jogging session and then it captures a 30 min slice of your activity so you can work out how many steps you took, regular heart rate tests and then extrapolate calories burnt.
This is clearly NOT a $200+ device that has full fittest capability.
Be that as it may, I recommend it for non fitness people. Its just a cool device.
Some people has said they got some with faulty OLED screens but otherwise, for the money, there's not much better.