How would you characterize the VAC tube amps?

I have been mostly using Pass Labs amps, which, as a SS, has a tube like sound. Now I am thinking that if I like the tubes sound of Pass, why not try tube amps, particularly VAC. I have Soundlabs electrostatic speakers, which are very fast, so I am looking for a tube amp >80W with some even harmonic sound. I have heard good things about VACs and I was wondering what type of sound VAC amps have. I am particularly interested in used VAC amps which may be more reasonably priced (assuming they are reliable). I would appreciate hearing from VAC users.