I have been wanting this kind of air conditioner since I first saw them.  We only have one window in our bedroom, and every summer we had to keep a big, clunky air conditioner in the window, never to open up to fresh air all season.  I am so happy with the portability with this air conditioner.  It is literally seconds to remove the tubing and framing from the window to open when the weather is mild.  When it is hot as blazes, this unit can cool down our bedroom in a matter of a minute or two.  Another great feature is that the blades are at the top of the unit, which means that the cold air is not blasting on us at "bed level".  We're very happy with this air conditioner and would recommend it whole heartedly!