Bought specifically for the resonator guitar (Harley Benton Custom Line ResoKing BK).
I tried an open D and G tuning, but the 6th string rattled a lot.
Rebuilt to open E and A, the guitar stayed in this tuning for 2 months and it became good.
"-" strings quickly lose their external luster, but not the sound.
off topic: Thomann, why don't you publish rate reviews in Russian?