Definitely a different lugged steel ride. I didn't have any preconceived notions with this frame, so the stiff and "dead" feel is an honest opinion. It rides very fast, and I am having a good time riding it, but boy, it has some unique qualities. I should track down the specified geometry.
My SOMEC in SL (56.5x54) with the ridiculously short wheelbase is less stiff by quite a bit.
Evidently Columbus actually had something going with the SLX/SPX tubesets besides a marketing gimmick.