I have two of them. I have my guitar lesson today and going to enquire about piano lessons. It's basically a one-string guitar. All the chords, inversions, and harmonies are the same. A lot easier to see the intervals when everything is in a straight line. My guitar teacher got me in the habit of learning everything on one string to get the intervals down automatic, so that should be a leg up.
I bought a dulcimer when I was in the Ozarks. Beautiful instrument. My husband was tuning it up and broke a string immediately. What the hell, said I? It's a freaking BARITONE dulcimer. Time to order strings...