Add me to the list as well.  I got a MicroCell at work because we have crappy coverage.  There are about 6 of us who use the microcell with a mix of iPhone 4 and Samsung Focus.  I can definately tell it's draining because when I'm at work, my phone chews through battery while I'm there, when I'm at home it lasts twice as long.  This is also with about the same usage, if not more when I'm at home.