Installation is really simple. The device is USB, and requires a SIM card (with of course a data subscription). The software does allow you to set up a forwarding phone number, otherwise a caller gets a busy tone if your using the SIM in your modem. Note that the software defaults to ask for your card's PIN number, which is a good security feature (but can be turned off).
Connecting is quick; you do of course have to specify connection details. Performance is dependent on coverage - if signal is poor you'll get dial-up type connectivity, but overall I had a good experience with it. It also supports various networks: HSDPA, EDGE, UMTS, GPRS.
What's great about the concept is that it offers you an extra level of connectivity on the road (or even at home). Sure there are often several wi-fi hot-spots you can tap into at an airport for example, but you also have to be mindful of security considerations. And there are still places DSL hasn't reached yet, and for those areas this option is ideal. Or if you simply want to ditch your Cable & Wireless land line & DSL.
It would also be especially useful when roaming overseas - you should for instance be able to buy a SIM card with mobile broadband from a provider such as 3 in the UK.
I also liked how the modem will work on a Mac as well as a PC, and that the device can also be used as a USB drive.
Marks out of 10: 8
Sony Ericsson Mobile Broadband USB modem MD300: EC$399 from Digicel Dominica.
