Bought this a few months ago after spending days trying to find a good portable a/c unit.It is a bit noisy, though I'm used to it. Also, leaving it on "auto" doesn't always get the room cool, but it *will* when set to "cool" (the modes are auto/cool/fan). It rattles a tad when the compressor starts up.The plus sides are power, portability, improved ventilation, and the fact that the window isn't blocked up much. I haven't had to change the water tank yet either.