OK, I'm almost 62 and pretty much a "Clydesdale". I started road bike riding in April, 2011 and have put in 2,500 miles on the road. I'm loving it. I have a carbon road bike with Ultegra group on it (Felt Z4) -- so I'm used to a "good" bike.
Yesterday, was a day off on the road, so I took my 2004 Gary Fisher Sugar + 4 to a local park with a decent beginners MTB Trail. I had a blast on this thing.
I bought the Sugar back in 2004 when I lived in Jackson Hole, Wyoming. And, did some upgrading -- XTR F&R Ds and shifters. Avid 7 Vee Brakes and such. The Summer's were short so it didn't get much use until we moved to South Texas in 2005. Since moving here it's not been used much at all. I'd bet it has less than 200 miles on it.
The Sugar isn't worth much on CL -- maybe $300. And it seems it would cost $2,000 to get close to that spec these days on a new bike. But the lack of disk brakes and the Black Elite fork worry me some. I have disk compatible wheels and the fork has disk bosses, but the seat stays don't.
Is this bike worth putting anything into it? Or should I just ride it as is and have a bit of fun with it. We're spending the Summer in Durango, and I plan to take both my road and MTB bikes with me in our RV (told you I was a Senior Citizen).