Originally Posted by CliffordK

I've used them off and on with my vehicles. A floor pump is quicker and easier than popping the hood of the vehicle, plugging it in, dealing with cords, etc.

However, they can be handy for kid's bikes, MTBs, and etc, all with low pressure. Some are advertised as "high pressure", but do seem to have issues with > 100 PSI, at least with moderate volume.