Uhm... My 500? I sold all of my 500 related stuff (3x A500, 2x A1084, hard- & floppydisk and much other stuff) only a couple of days ago. It was only sitting in the attic, doing nothing and would keep on doing that for years to come, so...
I use my A1200 and A2000 on a very regular basis, though. They get switched on several times a week. The 2000 is for stuff not running on the A1200 due to incompatibilities and thus only has some minor hardwareexpansions (harddrive, RAM-expansion, networkcard & flickerfixer). Both of them get used for retrogaming and fooling around.