A while back I purchased a Viar setup but it was never very fast so I sold it and went back to an old used but reliable mv50.
I'm the one who bought that compressor (400c)! It's working great and replaces my 400p, which is plenty fast enough for my relatively small tires. I'm happy to trade a little time to inspect the rig for the very lightweight and compact package.
I've got mine rigged tankless with a regulator on the output and a relatively low pressure switch so I can now just clamp it on the valve and walk around and inspect the vehicle, etc. until the compressor shuts off. I liked the 400p (portable), but the added steps of unpacking compressor, connecting/disconnecting the alligator clips to the battery, watching the fill-gauge to stop the motor, and re-stowing the now-hot compressor added
just enough hassle that I found myself hesitating to air-down so that I wouldn't have to air back up. Eliminating a couple of minor hassles makes me much more likely to air down, which is better for both the rig and the family.