I use 1680x1050 too. At times it seems to make things a bit too small. I think 1536x960 looks a bit better.More so than your reply!
Integer resolutions are the best, but Apple's system does a remarkably good job at making the other resolutions look great. I'm using http://www.pupil.io as a quick resolution switcher, generally at 1680x1050 as I find anything less to require a lot more scrolling than I like. For me the whole point of a high-resolution screen is that elements are sharp enough to allow for a large workspace on a tiny screen. 1152x720 is less real estate than I was using 10 years ago!
I'm all for keeping threads on track, but what exactly do you expect for a reply when the OP started a thread to simply state they like X resolution? Not too much more to say other than offer an opinion of what resolution we like.
Technically, there is always scaling involved. What you're referring to is essentially integer scaling - there's no interpolation between native resolution and the scaled resolution.I do feel that it makes everything slightly sharper and faster given that no scaling is involved.