Would be great - if it would work reliably

I think the clock toll. But the various dials are super. Even better would be if they would do what they want; namely, messages received.
At first I did the Pebble operated with my iPhone 4. E-mails have been received reliable; other messages such as iMessage, WhatsApp, Twitter, etc. only exactly once, after being coupled the clock - then no more. Now, with the iPhone 5S it worked for a long time much better. All messages and reminders were received - as long as you did not separate clock and iPhone. Then they have again found only in exceptional cases; mostly I had to re-couple.
Since the last update before yesterday nothing works. Again and again I coupling iPhone and Pebble new, then a time is exactly receive a message - then again silence. Although both are adjacent and are allegedly also coupled. Although the reception of the test message works. If no other message to more.

The annoying without end and I would recommend anyone interested to save the money and wait for the iWatch. Once that is there, flying my Pebble SmartWatch out in a high arc.

Addendum 25.8 .: Funny but true: iPhone off and on again helped; Messages come again. Let's see how long this time.