I've heard a few good ones over the years.
The first truly High end system I heard was down in Memphis back about '87 at dealer called Opus 1 (I think).
He carried ML & Krell gear. He wanted to show me the difference between analog & digital sound.
First he played an Accuphase CD player, which sounded really good, then he switched to a Linn LP 12 and blew my mind. I swear I could get up and walk around the performers, it was that clear, distinct and real.
Magnapan III A. I'm still a big fan of the Maggies, especially the 3.6, but I don't have enough room & amplifier for them.
Many years later I was checking out some speakers and the dealer briefly demoed the
Avantgarde Duos, another very special speaker, but way out of my price league.
At Hi-Fi 99 show in Chicago I got to hear a lot of speakers. Not very impressed with a lot of the big guns (Wilson, MBL, NHT, Avalon, etc).
However, the Merlin room was amazing. Standing room only, and people wouldn't leave dammit! Eventually I got a seat and was blown away at the sound coming out of these fairly small speakers. The bass was way more powerful than you would expect, and these speakers threw the best soundstage of any I have heard (well, other than the Maggies).
After owning the smaller TSM-MM's I decided to upgrade and dropped big bucks on the VSM-MM's.
They are being shipped to me this week