Lapierre,
I heard other speakers, but only in show conditions.
A large part of going to the CLX was for a change in scenery. Blue Circle amps are known for their robust power supplies and they have the ability to drive difficult loads such as with the CLX. I have also heard that many BC customers use stats as well, and Gilbert himself has ML speakers in his factory, so there is certainly a synergy with his amps.
The CLX is very different and I do prefer them over the Mezzos. You don't get the same visceral impact and propulsion of a dynamic speaker but it also isn't the ML of old, the CLX has come a long way in bridging this gap. What I find with the CLX is nothing sounds forced, it has incredible speed and absolute transparency and lets you hear everything in the recording, good and bad, yet it does so with delicacy and finesse. The CLX will not produce thundering deep bass, but what it produce, it does very well - excellent pitch definition, speed and articulation with virtually no overhang.