I received my Pebble in the first batch to ship. Sadly, I received one of small percentage of faulty watches and I returned it last week so now I'm waiting for a replacement. The screen would occasionally become unreadable; however, during the times the watch worked I was pleased with it. There's no software available for it aside from a few new watch faces but that should be rectified shortly.... I hope and suspect. There's a lot of potential and I hope the platform thrives but unless they get their SDK out soon I fear they'll lose developer interest as the smart-watch game is rapidly heating up and Pebble only has so long to capitalize on their publicity.
Internally, there are growing pains for sure and it's evident from user feedback on their forums but I'm pulling for them!