We got one last week, it was a waste of time.
Typically I never read the manual before I installed everything, then when it would not work I saw the documentation said only "certain" PCMCIA cards will work with it.
I tried Huawei 3G cards, Huawei HSDPA cards, Novatel 630 3G cards and Option 700 3G cards. None of theses worked with the USB adapter although they worked in my notebook. I did download all the latest firmware and VMC software.
I would wait for the USB HSDPA modems to come out around August sometime, in the meanwhile use a USB cable on a 3G phone if you can. That USB adapter is not cheap either, R 1 000.00, the USB modems are going to come in around the same price as the Data Cards.