If I didn't have this charger, I would most certainly have the Incase Power Slider.
The power dongle I have is quite a bit more inconvenient than the Power Slider. The Power Slider sells at Best Buy for a kind of cheap price around the $55 range. And last weekend I could've used a coupon to get 10% off. I have way too many cases plus my power charger to throw away money like that.
i've been looking into buying one of these cases for quite some time. I'm just concerned that it will add unwanted bulk to my pocket. I'm going to have to go into a store to see one, so i can make my mind up. My battery on my 3G is about to die.. it's on it's last legs.
I've looked at this case, and held it in my hand. I immediately gave it back to my friend. Too damn bulky... I never understand why people go for cases that make your sleek, little iPhone turn into a car phone from the 90's...