Samsung is notable in this field simply because it's issued so many smartwatches over the relatively short period in which smartwatches have even existed. It seems as though every time we turn around, there's a new Samsung smartwatch promising to wow us with new and innovative features.
Spinning bezel is ridiculously fun; Fast notifications; Excellent AMOLED screen; Works with most Android devices
Can't take calls; Tizen rather than Android Wear; Regular S2 model can't take a standard watch band