Been carrying a Slime cheapie from Target for a couple years; uses the cigarette lighter socket I installed on the right side of the fairing for power. Project for today is to replace the plug because the cheap cheap cheap plastic ring that holds the center connector in place broke a couple days ago. the replacement has a nice metal knurled ring in that spot, so it should never fail.
Only complaint about the pump itself is that there's no gauge so it's a juggling game to switch between the chuck and my tire pressure gauge to check whether I've got the desired pressure in a tire. I have a couple hoses and chucks and air gauges left over from now-defunct bicycle tire pumps; may look into cobbling something together if / when the chuck ever goes bad but in the meantime I can suffer and cuss.