Kensington PowerBolt Duo USB Auto Adapter & Charger for iPad1&2/iPhone 4 w/ Sync Cable (K33497US) Kensington PowerBolt Duo USB Auto Adapter & Charger for iPad1&2/iPhone 4 w/ Sync Cable (K33497US)

Pros: Very good

Cons: Very useful

Pros: Well made, has a charging light that tell at a glance if it is working.

Cons: None!

Pros: Compact, 2 USB ports which can charge two phones at the same time

Cons: The iPhone connector isn't very reliable. After a few times use, I would need to wiggle the connector each time before it could connect

Pros: Does what its supposed to.

Cons: None

Pros: None

Cons: Stopped working after 2-3 uses. Kensington does not provide a warranty for this, so you are out of luck when it dies

Pros: Every one of these i have sold and bought has been perfect.
Not only do they work well but failure rate is almost none.

Cons: none

Pros: None

Cons: Not working.

Other Thoughts: Used it 2-3 times only and it stopped working. Does not charge ipad2, iphone 4 and samsung galaxy s2.
Other car charers work fine in the same car.

Pros: It has two usb ports.

Cons: The charger does not work with my iPhone 4. I've had problems with other chargers too, so it might be a car.

The charger sits higher in the socket than the picture suggests, make sure you check the dimensions first.

Other Thoughts: Not a big deal, but the cord connection to the iPhone is huge compared to other usb cables.

Pros: Charges great!

Cons: Causes AM interference on weak stations when charging.

Pros: Equivalent cost to factory unit
Compact
Multiple full-power charge ports

Cons: None so far

Other Thoughts: I regularly use this to charge multiple smartphones simultaneously. Zero problems to date. Have already recommended to several friends based on my usage.