Thoughts on Pass B1 buffer "preamp"?

Hi everyone,

My system is a fully horn loaded 104dB multi-amped system with an analogue active crossover. Main source is digital, DAC outputs a high 3v. For years and years I've been using the same vintage preamp, that I love, an almost unknown Korn&Macway SP100 that sounds fantastic.

Lately tho I've been wondering about trying out a simple buffer volume control such as the Pass B1, as with the preamp most of my listening happens with the volume pot well under the 09:00 position. The preamp has a great potentiometer (ALPS Black Velvet) and sounds great even at these low positions, no channels unbalance or such, but still it seems stupid to throw away so much volume to amplify it again farther down the chain.

I'd also love to have something that I can thinker with easily (swapping coupling caps, trying a stepped attenuator, that sort of things, without demolishing my beloved preamplifier.

So I'm looking for people who are using or have been using a B1, for reference. Basically, does it sounds as good as the hype says?