The two air ports is really nice in one this size because I can put the compressor underneath my workbench and mount a static line on my workbench for easy access anytime while leaving the other open for longer hoses. These size compressors can make an INCREDIBLE amount of noise, but the Porter-Cable 3hp 4 gallon side stack really keeps the noise level at a minimum. From the nicely padded feet to the obviously insulated drive casing, this quiets it down as much as can be hoped for.
Darn Good Little Compressor - Short and sweet - this compressor delivers on its promises - it is easy to use, easy to break-in, easy to maintain, and you can't beat the duel air hose inlets. I have found both of the built in pressure gauges to be accurate, and the oil-free motor is quieter than other compressors I have used (although it still makes a good bit of noise). To me, that's portable - I can understand how that would not be the case with everyone, but my experience leads me to believe that this compressor has a very good weight-to-horsepower-to-air storage capacity ratio.
This Portable Compressor is Rugged and Well Built ! - Surprised and impressed! I looked at Home Depot and Lowes and decided to order this air compressor to save the Tax and the trouble of bring it home.

Looking at the other brands of portable compressors I really like how well this one is built.
Fantastic Compressor - I was told by others that none of these smaller compressors would do that.
First Impressions... - This unit is compact, relatively light weight, fairly quiet, and fills up extremely quick! I can't wait to attach my air nailer and get to work!!!.
Heavy Duty versatility - I run one in to my garage for airing my tires, and one in the shop for projects.
I will tell you it is LOUD but so are all compressors in this class, and this one is not as loud as my last old Campbell-Hausfeld.
Great little air compressor - This air compressor is great! This unit is fairly quiet, compact, light enough to be toted around if needed, no oil needed and very powerful. This unit replaced a 12 year old 15 gallons, 2 hp, craftsman rolling air compressor and all I can say is that I wish I purchased this unit sooner. It runs quieter and is definitely more powerful then the craftsman. I consider this a plus though, because I always drain the tank after each use and it does not take as long to release all the air. At this price range there are many choices out there for anyone looking for a compact air compressor but when you start to compare CFM ratings @ 90 PSI this one has the highest ratings.
Better than the pancake model - Believe it ir not, though, when it does run it is quieter than the smaller one and it runs a fraction of the time before it cuts off. The only thing I don't think is an improvement is the knob for adjusting air pressure.

This time I installed the compressor with the air hose reel from Amazon mounted right beside it on the floor.

I'm really happy with this tool -- its quiet operation (well, relative to the other one), short run time, and it stows out of the way in the same space I had the smaller one in.
Great General Purpose Portable Compressor - I bought this compressor to run nail guns, air sand and spray paint. It is also handy to limit the pressure to safe levels for your various air tools. It is not as loud as large upright compressors, but it does make a fair amount of noise, although not as much as I expected. I use it with a Souix air sander and it does run longer when I am working.