There are fitness trackers and there are smartwatches, but there's only a small number of devices that attempt to be both. The Garmin Vivosmart is one such exception. It's a $170 band that does everything you'd expect a fitness gadget to do: track your steps, calories burned, distance traveled and sleep. In a unique twist, though, it also has an OLED screen showing things like emails, texts, Twitter and Facebook notifications and incoming calls. In essence, it's a full-fledged fitness tracker that also acts like a full-fledged smartwatch. The question is, can it do both jobs well?