Serious thoughts about Audio Research LS 27

Hello, I'm considering to buy a second hand  LS 27, but unfortunately I cannot listen to it until I will go to pick it up, 300 km from home. Is there anybody here who is able to describe its sound maybe comparing it with the LS 22, LS 25 mk1, LS 25 mk2, Ref 1 and Ref 3?

Thank you very much!

Kindest regards

Mario - Venice, Italy