Without wishing to be rude, I suspect the reviewer below may have put his/her SIM in the device either the wrong way up or the wrong way round, which is easy to do as it's not obvious at all how to insert it (I had a little period of trial and error myself...!)
Anyway, once I'd got my SIM inserted correctly this device was a doddle to use: cheap and cheerful interface which is extremely straightforward and backs up all of your info reliably and pretty quickly. I was actually a little surprised it worked because I have a ToucanMobile SIM, which aren't very common, but I guess they're all the same in technical terms.
As for the software, I had to insert the installation CD a few times before it would work, but then again I've got Vista which no software company in the world seems prepared for! It was very easy to install once my system finally recognised the CD, though.
So, overall I'd say you really can't go wrong with this, especially when some models are three times the price and do exactly the same thing. Recommended!