It might still be a bit too early to tell, but so far my Pebble has stayed connected to my phone and I've been getting notifications for more than 3 hours now. With the earlier betas the watch wouldn't stay connected for more than 45 minutes or an hour max and often only 5 or 10 minutes. For what it's worth, after I installed beta 4 I forgot the pebble bluetooth devices on my phone, deleted the pebble app and reset the watch to factory defaults. Then I reinstalled the app and reconnected everything. I'm not sure if that was necessary or not, but so far it's working much better than it had with the earlier betas.