I have cryoed VA EL34's from Tubeman in my Cary Cad 50's(replacing svetlanas) I paid $69 for matched cryoed quad. The difference was immediatly noticable, the VA's have much more range and speed.
I should add that these are used to run the highs in a biamped setup so I no experience with them below 300Hz
I picked up a spare quad, I know I'll be kicking myself if these become unavailable one day.