The biggest problem with these units is the server/system they connect to is crap. You buy them for $150 from the AT&Suck store then go home and find out they're not holding up their end of the bargain.
While I understand it's really hard to get new cell towers put up, there's no excuse for rolling out this system to consumers then not backing it up with enough horse power to handle to load.
/Rant...sorry, I guess I was angry about that.
I was able to use the femtocell for free, but had bad luck with it.