Vivid Audio Speakers

I've heard the big Giya speakers at shows, listened to the Oval speakers at a dealer, and listened several times to the Kaya at a friend's place.

They are indeed "vivid."  Super transparent, detailed and sky high airy high end.   Everything sounds "right there."

However, to my ears, I found it more of a "hi-fi" vs "natural" sound.For instance, even well recorded voices tended to sound unnaturally vivid/brightened/sibilant/electronic.   I remember in particular a Joni Mitchel track, and the Kaya produced a super clear sonic image of her voice, except it just didn't actually sound very human.   More like a super vivid electronic hologram.

The same track at home (on my Thiel 2.7 speakers/conrad johnson tube amps) sounded significantly more fleshed out, relaxed and more like a real human voice.

Yup. Vivid’s use of aluminum drivers made
their sound to monotonic in nature. Drums
Of different kinds for example sounds the same.
at the end of the day, i miss the colour that
paper cone brings to the table.

The unnatural voices of the Kaya prof mentions above (I have never heard vivid) probably has a lot more to do with the low side firing woofers with a high crossover point combined with the subtle rise in frequency response starting at 2k, just a guess. Probably makes for an odd acoustic center and makes that rise at 2-3k more noticeable. 

 The small bass drivers of the Kaya always seemed like a questionable design for such expensive speakers. I am a fan of displacement but always admired Vivid from a distance. The larger Giya models are way out of my price range. The engineering in them seems outstanding though. 
https://www.stereophile.com/content/vivid-kaya-45-loudspeaker-measurements

I don't mean they can't sound fantastic.

I remember being attracted in to a room at an AV show due to the amazingly "live" sound of a horn-based band track playing in the room...to find the vivid speakers playing.

I've also heard tracks like Genesis' Squonk sound astounding on the big Giyas - killer bass impact,  sonic detail, and imaging for miles.  I get why people like them, and they can no doubt sound convincing on the right material, or in the right set up.