I used the melodica on an open mic night, with no prior knowledge of the tunes. It was funky/blues/rock.
First of all I did not realise that all the keys are black. this means if you use the short mouthpiece it is difficult to see where you are on the keyboard. I would prefer black & white keys.
There are a few notes that are a little out of tune, but I suppose that is to be expected considering how cheap it is, and it does make it sound a bit like an accordian.
Using the long mouth-pipe it felt very comfortable playing one-handed with my left hand holding the instrument via the handle.
Playing 2-handed resting on a table, or my lap would definitely be easier if the pipe was a bit longer.
The instrument is quite loud, particularly when playing single notes.
Over=all I am happy with this instrument.