I have used and installed many Genelec's, I've always thought they are great sounding, low distortion, play very loud cleanly and are boring. They are pretty flat response and I guess they work well in a dedicated theater application which is where I have used them, even some of the big big boys with the outboard 6U rack mount amps, 1034B or something like that. The thing I was pretty disappointed is that the amps were made in china, I had to modify three of the 10 inch 2-way Genelec's so we took off the amp boards and sawed off the the MDF that houses them (we automated them on ceiling lifts to fit through existing openings behind a screen) the amp boards, power supply windings, are made in china which is only visible when you take them apart, and those are pretty expensive speakers back when we did this on 2005 or so.
I would use Genelec for a studio, dedicated theater, maybe PC speakers, but not for HiFi 2 channel playback, they are too flat, neutral and boring. They can play loud without distorting, but I like magic when I play music, I want to be in the room at the tip of the mic, I want to see the performers.
Honestly the best powered speakers I've heard in a while are the Heavenly Soundworks, they were at the Long Beach audio show and were pretty awesome, I do like the simplicity of just having 2 speakers and a source like a Aurender...
Regarding vibration control, it is everything, half the holographic, super detailed sound of my system I attribute to my ceramic cones, maple boards, sorbothane pads on the rack, carbon fiber pucks under the speakers, Schumann wave generator etc... and you cant use most of that stuff on a powered speaker system.