I started with a Nomad 2, only filling guns directly. Suited my needs but was SLOW and I was always paranoid of failure. Bought my first yong heng and it worked great for about 2 months, then a leak here, a leak there. Easy fixes. Then the little pressure gauge failed. Again easy fix. Again only filling guns directly. At 3 months, one of the high pressures lines coming out of the top of the piston burst. At this point, I opted to just order another yong heng and use the first one for parts. My second one has worked flawlessly for several months now. On occasion I've had to tighten a spot here or there where a leak pops up, but that is part of it. Hight RPM, vibration and radical temperature changes, things are bound to wiggle loose from time to time.
Now, I'm using an Alkin 31 to fill tanks, but I will never say anything bad about the yong heng. It's an excellent and affordable option that direct fills guns fast.
I will say this, you definitely need some good inline filtration between a YH and your gun. Air comes out of it very wet and oily.
Bottom line, if anyone is debating between a Nomad style compressor or Yong Heng, go with the YH for sure!