After a lot of research and asking around, I opted for the PowerVerter. We were driving to Colorado and back and needed a way to juice up the laptop without stopping at a diner somewhere along the route to charge it back up. The PowerVerter worked perfectly and it has become a permanent fixture in my car. It's compact, easy to use, and best of all, it does the job without fail.
I have carried this in my car, and it has been great to have. it is way less expensive than the car power adapter HP sells for my laptop & it powers it very well, with the added benefit that I can use small 120V appliances (& my Dremel rotary tool) in the car without having to run an extension cord out to the parking lot from my apartment. I have done work on the car, including soldering with this. I suggest everyone carry on in their car, and one in each car if you have 2 or more.
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