I think for many people, it may be hard to see something special in these melodicas (Hohner Piano 26s, 27s, and 32s). Some people may never get it, or not need the characteristics that make them special to me. They are after all of medium, maybe medium-high quality, just slightly clunky, not compact, and not particularly loud (but there is a way around that). The reed plates are not replaceable.
But I like their slightly mellow tone and their timbre, the easy as which I can bend notes, and of course the ability to execute the famous belly wah™ technique.
The secret to increasing the volume is to hold the back of the melodica near or against your chest, either flat or at a 45 degree angle, and the volume immediately increases.
Have fun with these Alan.