It’s true that this product is somewhat limited, but its only major drawback is the fact that you need electricity.
But I can vouch that the connection is fast enough for regular internet surfing. Probably would still need an ADSL modem if you want to do BitTorrent, and other things. But for quick portable access that can be shared, this kind of technology is good.
When you say “you can’t put it in your pocket and take it with you when you leave the house”, that’s certainly true. If you’re looking for something that can plug right into your computer, you probably want something like this: en.wikipedia.org/wiki/Huawei_E220
The thing about the MobilSpot that we make is that it can share the wireless connection. During Computex we took a bus load of customers down to Kending. During the trip we plugged in someone’s 3G card into the MobilSpot and then everyone on the bus was able to connect to the internet over WiFi (802.11g). It was pretty cool driving down the road at 60 kph and being able to surf the web.
But it was having access to the bus’ 110V electrical system made this happen.
I think you could get one of those 3G USB modems when you sign up for 3G services. I’ve never used one but a coworker uses it all the time and he says it’s handy when you’re in a pinch and need to get online.