Great for down tuning
As would be expected with D'Addario strings, the main reason I use these is due to their durability. I keep strings on my guitars longer then I really should, and these tend to last months at a time. When new, they sound clear and have a great chime. When old, they lose their sparkle but they stay in tune well and still sound decent. I hardly ever break them in spite of my aggressive picking style. I generally tune down a full step and I sometimes use drop C. These give plenty of tension. They're also really good for E standard tuning on cheaper guitars where 9s or 10s would usually go out of tune. Another feature I like is the coloured ball ends found on all D'Addario strings which makes restringing much easier.