I have been a Martin Logan owner for the last 15 years starting with the CLS's, Monoliths, and most recently the SL3's. One thing one must keep in mind, the Martin Logan speaker can and will drop down to 1.7 to 1.5 ohm load, and that can tax some tube amps and low powered solid state amps. Like one of the above contributors stated they are "non-forgiving". My experience with Martin Logan speakers, the better the front end and the better the cableing as well as power cords and power conditioner (one can tell a difference) the better they do sound.
I must confess I have just recently bought a SET amp and it just could not drive them, sold the SL3's and bought more effecient speakers. I will own Martin Logan's again and again.......