The speaker phone is decent sounding and very handy for answering a quick call (tethered to my phone) without pulling my phone out. Does a speakerphone watch count as hands-free?
It also has fitness (w/ heart rate) and sleep tracking, which I do not use - much to my wife's dismay.
Connected fine to my Nexus 5 as well--a little too well, even: when I wanted to make a call from the phone (which, admittedly, happens rarely), I found that the watch was still trying to act as the speaker/mic. Not sure how to make it not act as speakerphone...?
Sleep tracking is nonexistent, btw. The health app---one of the approx. five it put on my phone---has a page where you can enter your own sleep info, but it doesn't do it automatically the way, say, my wife's fitbit does.
Also, the buckle is obnoxious and digs into the underside of my wrist, so I've found it fairly uncomfortable to wear for long periods.