Ray Samuels B52 vs. other tube preamps?

Could anyone comment on the sound (as a preamp) of Ray Samuels' B52 vs. other tube preamps at any price point? The B52 is wonderful as a headphone amp, but I wanted someone's opinion of it as a preamp in a good system, and how it sounds vs. good preamps from ARC, CJ, Atmasphere, Joule, etc.
Thanks in advance.
FWIW, it was compared very favorably to a VTL 7.5 by Enjoy the Music. Sorry, don’t have the link, but it shouldn’t be too hard to find. I’ve only used it a few times as a preamp—I’m mostly a headphone listener—and it sounded damn fine. Ray makes terrific stuff.
Thanks for that! I didn't know anyone had reviewed it.