I have two of them, actually.

1. 1994 Trek 850. Was my only bike for 3 years and did both commuting and MTB. As I've expanded my collection, it has evolved into primarily a commuter ready for bad weather:



2. 1998 Gary Fisher Hoo Koo E Koo, still my main MTB. But it's converted every December into my ice-bike, as shown here:



I've been the only owner for either. Both frames have well over 10,000 miles on them.