Quiet, powerful, capable, and reasonably efficient.  We had our last Frigidaire (this exact model) for nearly 5 years before it stopped working.  Fortunately, Frigidaire has an excellent warranty & our product was replaced.  It did take a while to get the replacement though so keep that in mind.  While we were waiting, we bought a different brand which we had intended to be a back-up A/C unit after our replacement arrived, and it was pathetic.  We didn't realize just how quiet and effective our Frigidaire was until we had that sad alternative product in our home.  For us, it's Frigidaire all the way.  Make sure to register your A/C because it extends the warranty should anything go wrong with it - even 5 or 6 years down the road.