I am currently playing a Brancher tenor J 27 and I must say it is great fun, very easy playing (with Ponzol reeds 2,5) and I really look forward to get my Super 20 tenor back (which was repadded by a friend so I left my Ponzol M1 105 in the case for him to play the horn with my favourite mouthpiece).
I like this mouthpiece so much that I am seriously contemplating the possibility to buy a similar one one alto too.
Funny enough, I disagree and any similarities with a Berg Larsen this is a much darker piece and has a ease of play that , with this opening, I've never had with any Bergs that I've ever tried , besides manufacturing of this piece has to be among the most precise and best ever achieved in a production piece.