I had a chance to test this baby out, last night. The previous day was reset battery stats and letting discharge.
I used GoogleNav for an hour long trip, with the screen on the whole time. Used about 20%, for that. Anyway, I am not a heavy phone user (save for emails and texts). So far, I'm very impressed with this battery. That measley 220mAH sure seems to make a difference.
Another thing I'm noticing, is that after topping off it does not drop by ~4% after a few minutes off the charger. I'm beginning to wonder if this battery is designed differently. The stock Tbolt battery seems to have a built-in overcharge protection (hence, the above behavior). Seems like this one doesn't. May be wishful thinking. I don't know whether that behavior is actually intrinsic to the battery, or the phone's CMOS.
So far...very happy with this purchase.