the window unit AC bought me one night's good sleep.
but it never mounted "right" because it made assumptions about where wood would be in my window sill which weren't true.
and the second day of running, it decided to start leaking water into the apartment. so now it's sitting in the bathtub draining. fortunately, the weather is better tonight (i.e. it cooled down a little bit), but... BLAH.
I should have spent more time on market research, I guess, finding a window unit that doesn't have the construction/ability to leak indoors. :/
as of now, though, this is what I can add to any potentian window-AC market research:
Samsung AW060CM -
installation - PitA: to install it, you must screw in the side panels (the extendable flaps to make it fit varied-sized windows), but the screws are "under" the flaps, so you either need a Really Fancy screwdriver or tons of time/effort to get the dang things to insert when your screwdriver can only get a shallow angle to the screw heads. Plus, all the mounting holds assume you have a great deal of flat window sill. Fortunately, it's light enough that you can ignore the extra mounting holes and just use the window top to hold it in place, but that's also scary.
design - it sticks several inches into your room, and leaks water into your room after about 30 hours of use. fun.
noise - high noise level, even on a low setting.
cooling - worked pretty well for cooling. it brought my 450 sq foot living room down to a comfortable temp even though it's rated for a 200-250 sq foot room. technically, I bought 2 (one for each side of the long room), but one was pre-damaged and I never installed it... which was good because it left me less to de-install when it started leaking on me, but also bad because it was a waste of money - it did okay for the big room with one unit and two was overkill. and, of course, also bad because I had to return one. but I can't really speak to percentage of damaged units with a sample size of 2.