anyone played a Fryette Boostassio high voltage pentode pedal?

Has anyone tried one of these Fryette high voltage tube effects with an ef86? I tried the SAS distortion in a GC and wasn't blown away. As a ight OD you get some tube flavor from the EF86 pentode, but as you crank the drive it gets more and moe like your average distortion box.... don't want the toen control either. Didn't care for the single knob tone and coulda done without it. I think its basically a hard diode-clipping, DS1/OD250 type thing powered by a tube instead of an opamp. I could see its uses I it didn't have the tone control because it did great low-gain tones tat kill transistor and dual triode-based OD boxes when the diodes were just clipping your hardest peaks and the tube would change "color" based on thte input signal dynamics, but I couldn't get the tone control to interface well with every amp I put it thru... they shoulda left her flat or done TMB tone controls.

But Fryette (aka VHT) also made the Boostassio which is a high voltage EF86 boost with just output and bias controls. Obviously output controls how much signal you send down the line, but bias controls the plate voltages to take it from hifi, recording gear tones to really grimey, mis-biased skronk. Anyone tried one?