I'm another member of the IBM Model M club
Mine's made August 28, 1997
I've been using it nonstop since August 2004.
It's PS/2, but luckily HP laptop docking stations come with PS/2 ports
I've spilled things in it before, and used it a ton, and the only casualty is that the 5 on the num pad doesn't work that well... it doesn't 'click' anymore, so it's kinda weird to use.
Sometime it can be inconvenient to not have a windows key, but otherwise, this thing rocks.
I have 3 identical ones that I got from my high school when my friends and I were helping the IT guy clean out old parts... it was a big box they were throwing away... I only grabbed 3 because I needed to carry them home on my bike, but I should have taken the box.
A year or two later, I added a 1984 model (with detachable curly wire) that I got for like a dollar at a flea market.
my roommate complains about how noisy it is, but I don't care.
Mine has really odd keys... I've never seen another one like it. It's got all the normal symbols, but then there's a second set in green. And the 'enter' on the numpad is bright orange. They're kinda a weird selection.
If anyone knows what they mean, I'd be interested in knowing.