I owned the 3-input passive, ended up selling when I went to an integrated amp. Still regret it a bit....even though I'm not using a power amp !
I've had Counterpoint, Krell, Pass, and (briefly) Audio Research preamps. This was the best for clarity and letting more music through. It had very good, deep, fast, and punchy bass - a rare find in passives. And basically was neutral from top to bottom.
The ONLY negative - and it's nit-picking, believe me - was a very slight dryness added to the lower treble. A slight recession perhaps that gave a slight darkness to that frequency range.
Still, it was better than anything else I had before.
One technology I HAVE been curious to try is transformer-based passive pre's. Bent Audio supposedly has some nicer, less expensive units, one even offering remote control. But I have no experience with it/them, hence the Placette recommendation.
HTH,
Todd - chams_uk