Last week a customer came in for a consultation. For fitting purposes I usually have people bring in whatever bike they have that is most like the one they are going to get from me. This allows me to get a bunch of useful measurements off their bike: saddle height, stand over, etc... Thing which generally are fixed and wouldn't change with a new frame geometry.
Well he came in with a bike had built for myself back when working at Bilenky, probably ten years ago. I had sold it to someone years ago. It's now on its third paint job and fourth owner, and still going strong. I only sold it to get funds to make another frame. It was a great bike, in the two years I had it we went on lots of great rides. Impromptu centuries from Philly to Newark, s24o's to the T-Town bike swap, and more day rides and commutes than you can shake a stick at. I even still have the original plan than I made the bike off of (printed off an ancient Apple computer on a dot matrix printer, of course).
The bike's new owner loves it. And more than anything I'm happy that it's still being ridden.