Hi Brach,
i had the old classic and bigger ernie ball. i can see that its a better fit for peaple with bigger feet 🙂 my feet are just at the sweetspot for a JR. so i can see a use for a 2nd line. i think i would even enjoy it and regret selling my old one! especially because the control on the treadle action would be even more precise.
the sales would be lower then for a jr i think, because the jr became the “standard”a while ago. BUT, there is no spareparts set/kit for the classic anymore, so that could be an in as well. (i looked, which was the reason to get a new jr…)
hope this helps! the kit is wonderful, and so im not looking at the lehles anymore 🙂