I'm currently using an old XI Demon that I bought in '96. Still has the same string even!
It wasn't even that great of a bow back in '96, but ssshhhh.... don't tell the critters I kill with it.
I'm big fan of little round wheels.
Here's my other compound. Bought this back in '87 (when Justin was still riding around on his Bigwheel)

It's got a cast iron riser and truck leaf springs for limbs. (okay, not really... but it does weigh 7lbs)
The other bow I shoot a lot is a Browning Nomad recurve that is as old as I am... and that's old.