Aesthetix Callisto owners help please

I'm contemplating this pre and would like to get input from current owners on sonics with and without any tube rolling. I may or may not get the chance to audition locally, but have spent time with a Janus and have some grip on that sound as a point of referen

Associated equipment
Moscode 401HR
Dunlavy SCIV-A
CEC TL51X into Genesis Digital Lens into Modified DAC60 as source

Thanks