I like both types. But I'm talking about the old style enduro/play bike 4st, not the new grenade bikes. The old XRs, TTs, and DRs would last a lifetime with only the most minor maintaenance, engine wise.
I love my CR500, but i also like to ride my old DR370 (White Bros AL. swing arm/ Works Perf. shocks/ Terry fork kit/ Super Trapp). It can't be directly compared to the CR500, since they have different missions. It's a "mellow" bike that can putt along at walking speed, pull wheelies without having to do light speed, and yet still tops out over 70 mph. The CR is a rocket, with great acceleration, speed and suspension, but you constantly have to be "on top" of it, or else you get hurt.
We don't all ride MX tracks exclusively, but anyone who says doing 70mph in the dirt on an old school machine isn't "exciting" is full of carp.
Regards,
M.R.