Well, to re-cap what is elsewhere, I tried them first on a Mugen THE-78 (allegedly the individually luthier-built versions of the respected Daion THE-78 fromt he Yamaki factory) and it was TOO harsh and clangy.

I use them on the best of my Hagstrom J-45s - they give it a lovely shimmering bell-like quality.

I use EZ-Peg brass pegs on my second-best Hagstrom J-45 and while they do add shimmer the bass is now not round enough in comparison.

I tried them in my Martin OM-1 and it was not a happy combination.