Invested in one of these
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and it is just what I needed. Seems well made, comes with a nice carrying bag with room for a small curly air pipe and 3m of wire.
Takes a big 3500 van tyre up from 55 to 60 psi in about 30 seconds. For rear tyres on a compact tractor, 10 psi up to 20 in a minute.
Try doing that with a foot or stirrup pump!
Includes a nice secure screw-on valve connector, in-line blade fuse in the wiring, on-off switch on the body. Gauge reads 70 at 65 psi but adequate for the job.