Yes, but only as packages of pre-power, not with the exons, The Cursa/exons won out over Linn Naim and Ayre combo's. The noise floor is very low, it is not the most transparent of Pre's, but you have to spend one hell of a lot more than I was prepared to spend to better it. You can certainly find more Hi-Fi sounding pre's but in combination with the exons the sum of the parts is well in front of the individual components.
I used it as the front to a pair of Quad II's for a while (they were a short term resident), and it made them play music as well. It is certainly worth demoing in front of the power amps you have in mind.
It is possibly the weak link in my system at the moment, but the exons have such a grip and authority over the spens, and I am lothe to loose the synergy the system has in search of more Hi-Fi