Hi Adam,
I have a flat-back, plastic, Piano 26. It is a nice looking and handling keyboard harmonica. It has the smooth, mellow, darker timbre that I like. However, it takes a fair amount of effort to blow and is one of the softest keyboard harmonicas I have ever played. So it has its place, but I don’t play it very often.
Hohner Flat-Back, Plastic, Piano 26
Regards,
Lowboy