I have one at home and it works pretty good. Do have some issues with a delay in the audio. Sometimes gets as bad as 1/2 second. It will only work with a 3G phone. My parents have a non-3G phone and it will not use it. From your online ATT account access you can control who can use the MicroCell...
Went to the Apple Store in Modesto this morning around 7:15 and the reservation line was longer then the purchase line. I'll go back later today when it shortens up some.