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I have one and like it. There were some issues with the tips that come with it. IIRC, the one for HP laptops doesn’t actually fit. They will send you a couple of tips a year for free, but the S&H is a bit high. However, Woot is selling this item $10 cheaper then it did in past sales.
I’ve only used this to charge my ipod and my phone while on trips (both traveling purposes or just going home) but it really holds its charge well. I charge it once a week after using it to regularly charge my accessories. I have yet to use it to charge my laptop, but there are two outputs for various things, and lots of adapters.
If you have any USB devices they’ll charge as well.
They offer heads for many accessories, one free a year, but shipping is killer.
This is not mac-certified. At least, not when I bought it.