Just because this thread has been bumped...
An audio store has opened up nearby me and they sell Harbeth. So I'm often strolling by and stop in, sometimes to buy some vinyl. They usually have a pair of Harbeths playing.
I have to say...damn the Harbeth sound is seductive!
And this is coming from someone who actually sold his pair of Harbeth Super HL5 plus speakers not long ago! (I kept my Thiel speakers instead).
Harbeths have such a comfy sound, with beautiful tone, so rich and full and big and mid-rangey. I always marvel at voices through the Harbeths. Somehow they are portrayed in a more naturally soft and round, realistic way, vs most speakers which make vocalists sound more hard and electronic.
And the Harbeths seem more amplifier agnostic than other speakers in my experience (as Alan Shaw would claim). I favor tube amps for my speakers, and the SHLplus speakers sounded great on my Conrad Johnson tube amps. But at the shop they are hooked up to SS amps and they still make me stop in my tracks, beckon me to sit down and stay to listen.
Ultimately I know through comparison that I find my Thiels overall more satisfying for my tastes. But if I didn't have a wife wagging her finger about my speaker addiction, I'd likely grab a pair of Harbeths for a second system.