Gomadic version
I've never used the iGo one, but I've had great experiences with the gomadic battery backup unit as well as another one I believe I got from The Supply Net. The Gomadic one has a tip exchange similar to the iGo, but uses 4 AA's instead of 2 as does the other one I have.
Using it with my HP2215 and i870 cell phone, I've had no problems at all with powering up units from a dead battery state, or keeping it running for hours longer then possible without it. It's great for long flights, hiking/camping trips, and especially for college classes that last over 3 hours.
I really don't think 2 AA's have enough power to work with most of todays devices in any effective way, but the 4AA units work great.
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