The ARB twin is worth every penny. I had a cheap Smittybilt for some time and ended up replacing it after it crapped out. So I had to buy 2 compressors and fabricate two mounts. Should have just bought the ARB first, which is Australian-made compressor and is very heavy/well-built. Although, it is certainly depressing that it costs about the same $$$ as a
60-gallon, 240V shop compressor.
One of my buddies has a M18 inflator. When we go wheeling, he'll get through maybe 2-3 of his tires in the time that I can air up all four of mine and 1-2 of his.
Honestly I don't really care much for other ARB stuff. I've mangled their skids, don't really like the look of their bumpers, and will be foregoing their air lockers in lieu of Harrop e-lockers. But, the compressor is a great product.