None so far, S2 as well. Worn it in 3 fires since i got it in Sept...Only issue was forgot to engage the "water lock" on one fire, ended up getting locked out of the watch for 60 min due to randon screen/button presses causing it to get random passcodes entered in several times. No physical problems at all. Trying to get in the habit of tightening the strap and engaging the water lock whenever i gear up...
Eta: I cant count hiw many fires where my phone has been in my pocket. Beyond the occasional butt-dial, Ive never hurt an iPhone on the job. I expect the Watch to hold up fine. Bands could break but so far so good.[/QUOTE
Phone I'm not worried about. I pumped at a job last week and when I removed the intake cap, I had some residual water dump on my thigh. Phone was fine though. Now hopefully a developer comes up with some apps that could go hand in hand with what we do.