Has anyone heard the NAT Utopia preamp

I was wondering if anyone has heard this preamp? I read the review of the Plasma in Tone. I was wondering how the big brother of this preamp would perform in comparison to the Plasma?
I have the Plasma preamp in my system along with the Se2se mono amps. All I can say its one of the best I have so far. Its slightly on the warmer side but its got fantastic dynamics and bass response. I like its signature. Definitely you should audition it.
I have not hear any of the other preamps.