I bought these for my acoustic archtop guitar, and found that they bought out some more brilliance and brghtness compared with other nickel D'addario strings. I wouldn't use them on my flat-tops, as I'm happy with Phos Brinze for them.
Good product will use again.
I put these strings on my son's acoustic and the improvement was incredible. The mixed gauge works well and the bass strings give off a lovely sustain. I have had good sound from old strings in the past but these were a major improvement on the set being replaced. The quality is tangible and seems to lift the whole guitar. I bought another set and put them on an old cheap Fender and wow what a difference.
Highly Recommend