Thanks, Raneroger, I just signed up!

About those grooves: yes, FlexiFrets can be distracting for some people. There is the 3/32" brass band across the fretboard when the fret is removed (I tried various dyes and oxidations to match that to the wood, but it all wears off pretty fast), and the little groove. But, maybe you'll come across a dulcimer that has them installed if you go to dulcimer festivals. You won't really be aware of it if the fret is installed, though. I go to a few festivals, mostly in the northeast, if you ever get up that way...

Best,
Dwain