I just received my Jawbone Era. After finding an ear peace that made it fit well enough (great that they include so many options), my biggest issue so far is the method used to switch on voice dialing--hold the talk button for a couple of seconds.
Most of the time when I reach up to my headset, its to make a phone call! Tapping the call button once to hear how much battery life I have left is almost a non-feature (the Jawbone displays that nice battery indicator on the phone, after all).
I'd MUCH rather have the option to use one-click for voice dialing while holding down the button a couple of seconds tells me the battery life.
If you're listening, Jawbone, PLEASE consider making that an option!!! (Assuming it's not impossible for some odd reason). If it's already an option, PLEASE let me know--I've totally missed that setting.