Just your run of the mill Campbell Hausfeld 6hp/60gal here. I bought it second hand and it seems to be in decent shape.
I'm about halfway through the installation and the story starts here if you're interested:
Linky
In an effort to gain some usable space below, I'm getting it up off the floor and it will be enclosed in a ventilated cabinet when I'm all done.
Current status is the addition of some special valving and soon the automatic drain system:
Gauges, regulator, and hour meter will be located on a control panel down where I can reach it easier.
I will give a quick update when it's all finished.