@40cd5708 I use mine with a pixel.. They limit the use of the blood pressure monitor and ECG but really don't care about that (and there are workarounds if you do).

I've had round watches since the moto 360 days and never really noticed any issues.  Watch faces look better round IMO.

Samsung seem to actually get watches right, which surprised me as someone who avoided their phones for years after encountering touchwiz. 

 @40cd5708 Depends what you mean really.. GW4 with the google calendar  and clock installed works fine.  Not sure if they've fixed the pixel watch yet.. at launch alarms didn't work (one of the reasons I returned it).

If you mean setting alarms on the watch, I've never done that.