I listened to a set of Sashas at a friend's house (also a well-known reviewer). We brought over a set of our amps (MA-1s) to play- I have to say I was quite interested to see how the two worked together. The MA-1s replaced a transistor amp of twice their power.
It turns out that the Sashas are very easy to drive, the meters on the MA-1s barely moved at all, yet we were getting a very satisfying volume from the speakers- I was worried we might disturb the neighbors. Very fast speaker, very articulate, good cohesion between drivers, spot on imaging, good lack of signature, quick, articulate bass that was extended without boominess but nevertheless easily conveying weight as the program material required. In a nutshell :)
Its obvious that Wilson likes tube amps, so far every single speaker he has ever made has worked with our amps and most every tube amp that can make any power.
Excellent work.