So it sounds like the cheaper compressors perform pretty well for filling up tires and it may not be worth the extra $100+ that the big name brands charge for their portable air compressors? Or do the TJM/VIAR/ARB compressors do something more than the $60 ones?
The "name" ones have a nice brand name and maybe even a sticker?

Some of them have a strong "family resemblance" likely made in the same factory? The MV50 is very similar in look/performance to one of the Viar models at a fraction of the price, the Puma is close to the Extreme Air and includes a tank, etc, at ~1/2 price.
A bunch of local users have been beating on MV50's since 2005, have proven to be very durable. The failures have been rare, wiring and hose related. On some the connectors were not crimped as tight as they should be, in most cases, simply re-crimping them solved the issue, a couple have rewired them.
In our experience, air up races, the MV50 is on par with the similar Viar model, they are slightly faster than the Harbor Freight unit. A couple have run the MV90, not impressed, both are now gone replaced by Pumas.
IMHO, the MV50 is a good unit, portable, etc. One strategy that some of us used is; run two, one for each side, makes airing up twice as fast and allows redundancy. This was mainly because we were early adopters, they were not proven, so paranoid about reliability, now,

, they work well.
When/if stepping up, I would skip the MV90 and go straight to the Puma. They have better performance, allow for the use of low draw air tools, blowing out the interior, etc. They cost a few bucks more, draw more amps and are less portable (mine is mounted, wired into the rig). But they are well proven, solid, strong units, I have been beating mine hard since 2007 with zero issues. There are now a bunch of them in our club with zero failures.