Van Alstine pre-amplifiers

Recently read a  post regarding Van Alstine tube based pre-amplifiers.

Sounds interesting .  One of the reviewers ( on the AVA website ) suggested the pre-amplifier did not add richness to the tone of the music and suggested the soundstage was not enlarged.  Otherwise a rave review.

Has anyone have personal experience with these tube based pre-amplifers?

My goal is to add tonal richness and improve timbre.  Plan to run into a Leben amplifier.

Thanks