As far as I can tell my original PS2, release year model (SCPH-39003), is still working. I last used it on holiday to play some Star Wars Battlefront 2 after I crippled myself sleeping in a bed too small for me on the Isle of Wight. Ended up stuck laying motionless for 3 days but for hobbling to the toilet and to bed. Anyway, it worked great, SWBF2 and Burnout 3: Takedown worked beautifully on it.
After I bought my PS3 it had a few falls off some 3 foot high drawers onto hard wooden floors, so I was worried, though it seems it survived unscathed. I hope to be able to still be using it nostalgically well into my 30's if not for longer.
My old Playstation works fine too, but the lid is a bit loose, sometimes needs weighting down.