Joeyboynj,
I haven't any cryo treated tubes but have read it's a mixed bag, some like and some don't.
In regards to 6SN7s, I've tried both Pvane, Sophia and prefer my Ked Rad VT231 by a large margin. Pvane was dark sounding, the Sophia were good with soundstage restriction compared to a true NOS.
Actually, I found the basic Sylvania Chrome Dome to be superior the Pvane or Sophia, but I guess it comes down to preference and system matching...