I don’t have any experience with electrostatics, but I was meh about my old B&W 803 D2 speakers when paired with pretty much any popular amp from McIntosh, Moon, Bryston, etc. Sound on occasion was harsh in the midrange. Some tracks I couldn’t even play. I know HiFi and poor recordings don’t mix, but these weren’t poor recordings. Then thanks to these boards I found the Diablo 300 from Gryphon. When I picked one up, suddenly I loved my speakers!
Just goes to show how much difference an amp can make…