It's not just "not wonderful", it's pretty terrible if you intend on actually using it as a button. I don't really use middle clicks for anything so the rest of the mouse is great for fingertip users (minus the slight acceleration of the sensor).
Are you on Verizon? I've heard of massive battery life drops on the Verizon model (even relative to the GSM counterparts).
You may have to disable the background auto-refresh feature for Apps to get battery life back to normal.