We ran one for 3 months and found it worked well in major cities but was very very unreliable once we where on the road.
We switched to a mifi from
http://millenicom.com/ backed up by our MotoSat (Sat internet) which has worked great for us. I can not be offline due to work considerations and this has been the only setup that has allowed us to travel without restrictions when the kids are out of school.