I would bet they've never heard anything better. Is it just me, or does this amp look like a poor man's Woo (and that's not saying much). At least Woo gives you some nice looking gear at less than half the price (the circuitry on the other hand is a different story). Aren't the transformers like some of the most important components on a tube amp?
Well said and completely agreed.
I've owned RS1, HF2 and SR225 and while I found them very enjoyable, sub bass roll off was definitely there and Tyll's graphs tend to show as much. My JH13s just go so much deeper.