Got my 1200 Mk1s second hand in '92 - geezer had had them from new in '88 - if they're not the single best thing I ever bought then I don't know what is - rock fucking solid and give every impression they still will be in another 25 years. Amazing really...
Back in the days when a lot of clubs didn't supply their own decks (kind of like now if you play vinyl, come to think of it), I'd cart mine around with me to gigs. At one particular gig I threw, this girl was completely wasted and was trying to make a request. She completely misjudged the height of the step up into the DJ booth as she was trying to step up. In the process, she caught the tonearm on the left deck with her shirt and took it with her as she drunkenly tumbled into the booth - ripping it clean off in the process as it skated across the record like Toller Cranston. I had to finish off the night playing with one deck and swapping on tunes as quickly as possible. A memorable moment to say the least!
Anyway, she ended up being underage and I was smart enough to threaten to get the fuzz involved, so I was able to get her phone number and have her parents cough up for the repair. That was in the mid-1990s and I haven't had to do anything with them since outside of some soldering on a dying RCA cable.  I only grabbed her number for getting the repair done, you sick fucks! [/edit]
Any deck that can play nearly sideways or that you can do handstands on (a la DJ David from Germany via DMC competition) is one tough bastard. Nothing I've ever touched even comes close to durability or feel. There's a reason they're the standard and I believe everything will be judged against.
I never caught onto the whole CD thing. CDJs don't interest me whatsoever because basically, they're trying to mimic Technics 1200s/1210s and in my opinion, don't even come close.