Let the hive mind of Engadget get that for you.
"As someone who doesn't reside in the USA, I was wondering what would be the best way to get internet for my computer in the US for a couple of weeks? If it were Europe I know I'd look for some prepaid data. Is there anything similar offered by American carriers? A MiFi or a data SIM that I can tether from would work, but I'm trying to maintain a tight budget. Help!"
Well the idea of having a wireless one is that it can be used in setups where it is not really practical to have wires, eg, a projection setup where the wii is currently difficuilt to use. You have to have the sensor bar at the front, but the projector is at the back. Wireless sensor bar = good.
the idea of having a sensor bar that plugs into the wall instead of into the Wii would serve 99% of the projector crowd (including me.)
having to replace batteries every 48 hours of gameplay (assuming you remember to turn it off every time) is ridiculous, and i can easily string an extension cord through the ceiling and down the wall so that for all intents and purposes, it appears wireless without any need for batteries, with the Wii 30 feet away.
even Power-Over-Ethernet would work better than batteries, IMO.