Well I bit the bullet and bought one of these. I love the extra power on hand whenever I need it. Its been nice not to have to worry about my battery dying before I get home or find a place to plug it in. As for the reception, I notice no difference with or without the case on. This is on a 3gs. I have the same signal strength regardless. My one gripe however, is that when I watched YouTube reviews and read reviews from other sites everyone stated the pack added a full charge and still had some left over. My experience is if I'm at 20% and flip it on, the fully charged pack only gets me back up to about 65%. This is with wi-fi on and normal use but no bluetooth. I wonder if this has to do with the 3GS having a longer battery life (takes more to charge) than the 3g which most of the reviews I read were based on.
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