I've originally had a bto rmbp 2.6/16/512 for 2 months before eventually returning it and ordering a base base model due to dead pixels, and ip problems. Since it was a bto model it just took way too long to get any kind of new replacements, so I settled w/ a base model so I can swap it out immediately for another one in case I had to. Now after getting used to 8gb, I wish I had 16gb.
I like os x.8.2 but one gripe is its memory management. I prefer w7's memory management over that of os x. I still have a 4-year old i7 940 OC'd pc w/ 6GB ram and 580 sli running w7 and if I try to stress it w/ Crysis 1/2 running and have ff w/ 8-10 tabs, winamp open simultaneously, it nowhere near consumes more than 4-4.5gb at any given point.
Mac safari is such a memory hog especially w/ the infamous flash add-on "safari web content" I eventually run out of free memory and if I don't reboot it on a regular basis, it will show page out and swap increment from 0 to something > 0. The design philosophy behind memory management in os x appears to be to use all of available amount until eventually run out and then to start freeing up inactive memory and others. However until then it will keep using all the free memory until it has none left at which point I see non-zero page out and swap used.
I've had my pc on for weeks and even months w/o a single reboot and it never ran out of memory. I'm satisfied w/ the 1st gen rmbp but next year when they come out w/ a haswell refresh I think I know what config I will order. It probably won't solve "running-out-of-memory" issue os x.8.2 seems to have unless they tweak their mm algorithms but at least I will reboot less often and won't have to open activity monitor every hour.