I've worn mine for about a month now. It has a surprising impact and I wouldn't be without it.
I no longer fish my phone out of pocket, click it, glance at it, click it off, and drop it back into my pocket. Ever. I can't miss a text or a call, so I no longer think that I might have done. It is surprising how fast the tyranny of connection has built up and what an impact it is to be free of it.
I no longer sit at the bar and get my phone out when receiving a random text, interrupting my conversation. I glance down, and glance back.
Best of all? For the first time in years, I have something a little new. Remember when everyone had a different phone, and we'd sit and debate their relative merits, and every so often someone would have a really whacky one that would make you want to look and ask questions? No longer the case, ever. It is great to be in at the beginning of something new.
The Pebble crew are in there right at the start and good luck to them. Sure, the big boys will come in, and who knows where the market goes, but for now, if I was a betting man, I would place money on smart watches as the coolest and most culturally acceptable way of easing our ties to the handset.