Given that poor quality, i worry that the machinery is low quality too. But the machine seems to have functioned relatively okay in the little i've used it. (One seller of this model shows it at webpage <http://www.purennatural.com/prod_desc.php?prod_id%3 .)
(Generally, portable units seem to be a good idea. You can use less a/ c and energy if you can use the unit as follows: its hose must vent out a window, but within that limitation the hose is quite flexible, and each model probably has a directional vent, so with the hose and the vent you can change where the a/c is pointing, 360 degrees, so that it's right on you, night and day. Also, with a moderate amount of hassle you can truly port the whole unit to another window.)