I'm running the 1Cs at the moment, quite a bit easier to drive than the 2s or bigger. Even so, they can suck the Cymbals down if you push too hard. They start to compress on transients. At reasonable listening levels it works out suprisingly ok. I got them mainly because of their good phase and temporal response for test purposes. For me, I really like the neutral and uncolored tone of the Vandersteens. I can use them as a benchmark against more colored and lively speakers. It helps to provide a balanced reference. Still, I don't get the punch and slam I prefer.
I have also tried the Cymbals on some really big power hungry 4 ohm speakers, and it was sort of embarassing. So yeah, when they say to put 100W or more into something, then the Cymbal will not work for you.
On the other hand, if you have drivers that work fine with SETs or other low powered amps, then the Cymbals can do their magic. At RMAF I am going to try out the big Azzolina Audio horns. Unheard, but I trust the recommendations. So it will be interesting. At a gazillion dB efficiency, we'll be able to knock some walls down.
jh