I see that on Ebay someone is selling their Hayden/Wicki "Peacock" because "I have confused myself playing too many different instrument types".
Some of us have tried a second or third concertina keyboard whilst others have stuck to the one type . I think there is a general consensus that one's first keyboard is going be more successfull. There are cases where people have changed horses in mid journey and found the new layout suited them better. Are some of us content to divide our practice time between two or more instruments ?
I do not notice confusion due to playing both the Hayden and the EC but between Hayden and Maccann there is definately a case of 'too close and yet too far". I could play both Duet types but doing so would divide my available practice time and for some of us could this be somewhat counterproductive?