My MV-50 gave me almost 4 years of use - now it's mostly a spare.
I don't much care for how it attaches to the valve stem and the pressure gauge is worthless, but it works and appears to be easy enough to fix and maintain. Fuse holder melted on a ~100 deg. F day after airing back up 4 32" tires. Otherwise, no issues. Before using it I disassembled it, cleaned out the factory grease, and put in good quality grease which I presume helps it run cooler. No other mods to it.
Never got stuck without air due to a failure.
I use the ARB single compressor in their gray plastic box now; much easier to use and a bit faster, but of course costs several times as much.