I want to vote for "Cool."
For me, Klein MTBs, I mean pre-Trek ones, were ultimate bikes. That was because they were technically innovative and beautifully built rigs winning not only XC races but also DH ones in early days of 1990s. I've still owned an unsuspended Klein that has been my only MTB for over 15 years. I really love mountain-biking with it.
However, one thing I really miss is that I sometimes find guys who love collecting mint-conditioned Kleins rather than riding on dirt...