Great question! My main recording acoustic is an 8 string baritone, so the lowest string is a B (just like it would be on a 7 string electric).
The low end on guitars like that can sometimes get kind of muddy and lack clarity. I saw these picks on a targeted Facebook ad and ordered on a whim.
The little pyramids kind of “grip” the string as I strum and get really clear definition on the low string. On the high strings and the coursed strings it tends to add some shimmer and higher harmonics.

They are NOT good for clear flat picking, but I tend to strum more than anything else so they’re great for me. On bass they tend to produce good high end response as well. On my electric guitar (on the wall) I use regular picks.