I purchased this item about July. I placed it in my bed room and never thought that this AC will fill up my entire apartment. But, I did a test and it did! My apartment is a one bedroom in a prewar building. The kitchen is the farthest from the bed room and I can feel how cool it is! I would say my apartment is about 500-600 square feet, roughly. It's best when you leave it on a temperature below 75 degrees, if you're cooling the whole house and leave it on eco-saver mode.
This unit replaced an much older Frigidaire unit which was beginning to go. I must say the newer model has many nice upgraded features. It turns off when the desired temperature is reached, is much quitter and has insulation panels which work very well. It is also more attractive than older models.
I've had the unit for a few months now and I'm very please. It works great, it's quiet, the features are excellent (economy mode, sleep timer, remote control, etc), and the filter is much better than the older unit that I needed to replace.