First of all, Mods, the Apple Watch is NOT an iOS device so I'm not sure why this got placed into the "Alternatives to iOS devices" forum...
On topic, yeah from what I've seen of the band 2 (albeit very little) I really like what I see. I've always been much more interested in the watch as a fitness device with the smart watch features just being window dressing.
Considering you have to use the Apple Watch in conjunction with an iPhone, I'd say that while it technically doesn't use iOS, it's basically an iOS device. I think the important word in the title of this subforum isn't iOS but rather
Alternative.
I'm not interested - I had the first generation and though it was ok. Not great but ok.
I've since moved on to the Surge, which was much better in terms of exercise options, and some smart watch features. What came out of my using the Surge was the desirer to have a more smart watch features then exercise features and thus I sold my Surge and bought an apple watch
I also had the first version of the Band and while it was pretty good, it suffered from a few significant flaws.
1) It was bulky, not that comfortable and pretty damn ugly. Also, for the heart rate sensor to be effective, you had to wear it on the inside of your wrist (notice in their promo video that most of the athletes were wearing it in this fashion). This was actually more comfortable and easier to quickly glance at but also meant the display was rubbing into everything--couldn't wear mine when typing on a computer. Consequently, my display looked like it had been through war. The synthetic material used for the band didn't wear very well either.
2) The smart watch functionality was rudimentary when using with anything other than a Windows Phone.
3) No onboard storage for offline music playback. This omission was compounded by the fact that the Band actually has GPS and could be used for athletic endeavors without carrying your phone. So unless you wanted to workout in silence, still had to bring your phone.
Version 2 certainly looks more sleek and less bulky but it still looks a bit rigid. As a fitness device, it's offers tons of functionality and data can be integrated into lots of popular third party applications. It you're looking for more smart watch type functionality, not the best IMO.