I've had a black one from the initial Kickstarter offering for a few months. It's genuinely useful in my position, and as of the last couple updates has gotten to the point where I really don't have any reliability issues. I do with that it had better support for non-Gmail accounts. Gmail notifications work perfectly with message text, but when I was on the Nexus 4 my Exchange account would only result in an "Email Received" notification (no text). After switching to an S4 and Samsung's email app now I don't seem to even get that for my work account. Based on the volume of messages I receive I'm not sure I would enable it if it did work, but it would be nice to have the option and work with some filters to only buzz on critical messages.
Support on iOS was pretty poor as of a little over a month ago. Even with the latest (at the time) iOS 7 beta I really couldn't reliably get email of calendar notifications. Music control and text messaging worked great, though. Pebble compatibility was one of the things that convinced me to switch to Android, really.