Clayton Audio amplifiers are, in my opinion, extremely musical. They sound very clear and detailed, but also full bodied without "syrup". They have great authority but deliver finesse as well. They are suited for all types of music and home theater, if you wish. They mate beautifully with solid state and tube preamplifiers. Using my M200's and now my S2000 I have driven many low and medium sensivity dynamic loudspeakers. Although I had a pair of Martin Logan
electrostats many years ago, I still had Levinson gear back then. However, I have no doubts that the M200/M300/S2000 would sound fabulous with your ESL loudspeakers. Wilson Shen is a remarkable designer and electrical engineer and stands behind his amplifiers, but his company is relatively small, to missioncoonery's point. If you're looking for a great full bodied, detailed and musical solid state amplifier to drive your ESL's, I believe you will be most delighted with Clayton Audio! If within your budget, you might consider a newer unit as Mr Shen has improved his power supplies in 2012-2013. (Upgrades have been quite infrequent) They have a somewhat commercial appearance (the S2000 the most attractive) but are built like tanks, to last and deliver wonderful music for years. All the best!