i bought a black and decker model and it works great, sorta... i found that most inverters that you plug into the cig lighter can't draw any mroe then 80W of power... my laptop required 90W. SO, if i try to power it the inverter kicks on then off then on then off... If you get one similar to mine you can also run wires directly to the battery. this will allow you to run darn near anything. they say you can run power tools off of that thing (circular saws ect...)!
like i said, what they don't say is off the cig lighter it can only draw 80W.