I ordered a Kanstul MFII with Prana Backbore from a local shop here in Chicago about three weeks ago. I picked it up a few days ago and have logged a few hours on it so far.
I find it much easier to play than a Schilke 14a4a. My range hasn't changed, but I can play up to the limit of my range much easier with this piece. It's a very comfortable piece to play.
My only concern is that the alpha angle seems to be a bit high for my large chops. I have to be careful not to bottom out in the shallow cup. My adjustment has been to stretch my chops out a little to make them thinner instead of just shoving my face in there.
All in all, an excellent $65 investment. I can't wait until the next time I meet up with Horn of Praise. I'm gonna blow the hairpiece right off his head with my high G.