I’ve played many, many “in between” broadway books, and have used my 36b Frankenbone on all of them since 2009, but this is a game changer. The valve is low-maintenance, quick and silent; and with a wick 6bl, I comfortably get through to a low C, while maintaining the zip in the upper register. I’m amazed by how open it is as long as I don’t try to play it like a bigger horn.
Just thought I’d drop a review here - 100% recommended!