I have dropped my rating to one star after using this for awhile, I repeat BAD design.  You can't even turn it off and one with one hand because the cigarette lighter adapter cord blocks the switch.  It pumps fine, it just is a pain in the tail to use.Black & Decker ASI300 Air Station Inflator - Electric Air CompressorPrice:  $44.99This little inflator does the job.  It quickly pumped up my wheelbarrow tire.  The design could use work though.  Even though I purchased it due to it's ability to be run from AC or DC, I'm not happy with their implementation.  It works fine but the cigarette lighter adapter gets in the way of the AC power cord.  The AC power cord is so short that it necessitates using an extension cord to be able to get close to anything you hope to inflate.  Lastly it should have a molded handle on the top.  They could have just extruded a little more plastic and given you a handy handle.There are two snap on attachments in a nook on the bottom of the unit.  That was smart design, they are handy but not in the way.  I guess it looks like something designed by a committee, some good ideas and some not so good.  I don't like the plastic inflator valve.  That should be metal.As far as performance, it works fine.  I had a full blown compressor that I returned due to an immediate (when assembling) crimp in the air hose that prevented it from working correctly.  That had a metal inflator valve but the immediate failing of the hose negated the good thinking on the valve.This Black and Decker inflator works well, I am just surprised that a company like B&D; would not provide a better design.  The price is reasonable ($45 at Amazon) but still for $45 I think including a handle, a longer AC cord and a metal valve would not inflate the price dramatically.11/8/13 Retrospect:Design really is cumbersome.  The on/off switch is occluded by the DC power cord. You can't turn it off and on easily without looking due to that power cord blocking the switch.  The gauge is next to useless, it hangs up on the setting needle and thus turn off immediately until you can free it from the setting needle.  Kind of pointless to have an automatic off when it is stuck on the setting needle. Overall the pumping part works fine but the cord storage, cord attachment and switch placement as well as the poor gauge makes this far less satisfactory than I originally felt.