I own a couple of JK stencil B flats and generally play the JK’s instead of the Beugnier stencil low A that I have.  I think I prefer the tone of the JK’s and the action is a lot more friendly.  It’s rare that I need a low A so it hasn’t really been an issue.  Like most players I’d love to have a nice modern low A but the price of baritones has gone through the roof in the last few years.