I used to play a Hohner Gaelic IV which used this system. It was very heavy! Having all that weight in the left hand end on a piano or continental chromatic accordion is OK, but when you have to do rapid sudden bellows reversal to get some of the notes with that much weight - it can be done, but as soon as I picked up a pokerwork melodeon it was so much easier to play I was hooked!

Anahata