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.