I bought this air compressor to increase my air flow capacity over my previous (4 HP, single stage) compressor. I'm quite happy with everything about it, and it's a pleasure never to run out of air (and not have the motor cycling frequently) even on my most air-intensive tools. It's built with good quality steel, and the motor and piston system sound/feel very solidly built. I also like interacting with the company for tech support questions - it's easy to reach an actual human, they're knowledgeable and friendly, and they replaced a faulty part (my first auto-drain didn't work) without question. The only thing that could be improved is the manual on their website is pretty light on detail - it mostly covers installation (forklift operation, electrical hookup, etc.) and for example is missing an exploded parts diagram, details like how much oil to add, etc. They tell me a new manual is being written, so I look forward to getting it when it's ready.
I considered several other brands (Quincy, Eaton, and Ingersoll Rand). The main reason I chose EMAX was the sound baffling technology (and this demonstration / sound comparison: https://www.youtube.com/watch?v=VYel75zoAnY). The sound level is very reasonable, like what I heard in the above sound comparison video.
I've attached a front and side view of the machine -- the side view lets you see the sound baffling system attached at the back.
I recommend the "Industrial Plus" version of the tool , which includes an auto drain, intake filter, raised platform keeps cooler, continuous run, and Totally Enclosed Fan-Cooled motor. The auto drain feature is handy, releasing a brief burst of air periodically (you can adjust the frequency). EMAX tech support told me that with this feature you don't need to drain the tank. I turn my compressor off at the end of the day, and if I use it again the next day it still has some pressure in the tank (so takes less time to fill), while if I don't use it for a few days it drains complet...