I have most melodicas(!), including the old and new Vibrandoneon… I’m playing the Yamaha P37D a lot at the moment. It doesn’t have the refined tone of a wooden melodica, but its easy to play and has a character of its own.
I don’t use an amplifier, but I used to use a little rechargeable Fender Can amp, which worked well for small spaces.
Where would you buy an Eolina from? The Ballone Burini website seems to be constantly ‘under construction’!