Bought this from Amazon about 5 months ago to keep my Blackberry 8800 charged in my car. This product when used with my original Blackberry USB charger was about 1/3 the cost of a dedicated Blackberry car charger.
Pros:
1. Small and thin - this unit is smaller than the "traditional" USB power adapters that cost $2-$3 like this one from Eforcity. Size was important given the limited space I have available.
2. Angled USB Port - again, unlike other traditional models, the Kensington is angled so access to the USB port is easier.
3. Excellent power delivery - fully charges my Blackberry in 30 minutes while it's in use and connected to my car's bluetooth handsfree system. Even fully charged my 5G iPod in about an hour while it was playing through an AUX port (not recommended though due to the constant whine as another reviewed pointed out). An old adapter I'd used previously didn't have enough power to both charge and use my phone yet alone an iPod.
Cons:
1. Price - obviously not the cheapest option.
2. Blinding blue LED - with the angle, the blue power LED is bright, super bright actually. Not a big issue during the day, but it can be distracting at night. A small piece of black electricians tape or similar material works fine except if you experience Con #3...
3. Loose contact with car's power receptacle - probably more symptomatic of my car than the adapter, but it doesn't always make a tight fit. I've tried adjusting the contacts but couldn't make enough of a difference to help. Spinning it to a different location usually works but the only way I can tell for certain is from the unholy blue LED power light.
Was it worth $13? For me, yes; but I'd have given it 5 stars if the cost was closer to $8.
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Kensington Auto Power Adapter with USB Power Port K33418USProduct Description: Power your mobile devices in your car.No more running out of cell power or running down your iPod battery.The Kensington Auto Power Adapter with USB Power Port plugs into any cigarette lighter to power cell phones, PDAs, iPods, and other USB-powered devices.Simply swap in a USB Power Tip (sold separately) and this space-saving power adapter can replace the zoo of multiple charges all over the floor of your car.Kensington 2 year limited warranty.
Learn More About Universal Power AdaptersUniversal Power Adapters are a convenient choice for households and businesses that have multiple brands of laptops/netbooks. More compact and portable than standard OEM bricks, Kensington Universal Power Adapters can be shared between Users of different laptop brands simply by exchanging the tips included in the packaging. Also, many of Kensington's Universal Power Adapters offer additional functionality over standard OEM bricks by including a USB port to allow for charging peripheral devices (i.e. Smart Phone, MP3 Player, Personal Gaming Device) while also charging/powering your notebook.
Kensington's Universal Power Adapters are a popular replacement to lost or broken OEM adapters. But most often, users enjoy the convenience of having an additional Universal Power Adapter to keep in their travel cases for use on the road.
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Overall, I like this stand because of its versatility. This is one of the few products that will charge an iPhone in both landscape and portrait modes and so so in an enclosure that doesn't look out of place in an office. That's quite nifty and the product works well at keeping the phone charged all day. 
