Checked my wife's SGSII tonight when she got home from work. Reported cell standby as 6% of battery use, and 0% time without signal. She has Google Voice installed as well.
A couple of maybe related items:
a) When we brought both devices home, hers connected to our MicroCell with no problems. Mine would not connect at all, until I did a sim swap with her device. After swapping back to our original sims, both connect to the MicroCell.
b) with very similar time off the charger today (me at 10 hours, her at almost 12) and similar screen on times (me: 1hr 27 min, her 1hr 11min) she had 60% battery remaining, I had 33%. I am running some additional apps, and used google nav for about 6 minutes. She was in wifi coverage all day (except while commuting) I had no wifi all day. Not sure if the battery burn difference is justified by those differences or not - or if they are possibly somewhat related to the 0 vs 100 time without signal indication (I was only showing 7% battery drain from the cell standby).