I have a series 3. I absolutely love it! I love the step/workout log and the sleep tracker. I like that the faces are so customizable and I can choose what I want on the display. I got the version with cell service and I love that I can take it out for a walk or workout or shopping or whatever and not have to bother with having my phone on me. (Though I still take my phone on rides because emergencies, etc.) I like being able to put my boarding pass on it too when I fly, though at a couple smaller airports I still had to use my phone because the reader wasn't wide enough to stick my wrist in, lol.
I had a little rash from the band when I first got it but it turned out that the *tiny* little metal piece on the band has nickel in it, which I am allergic to. So I changed the band and haven't had any more issues. Really there isn't anything I don't like about the watch so far.
“A bad day of roping beats a good day raking.” ~Buck Brannaman
RIP Ben 04/01/1998 - 02/28/2017