I use this particular gauge on my Jackson Phil Demmel for the Machine Head Tuning, which is C# Standard and Drop B. 11 to 49 seems to be the only right gauge for that tuning, if it were any heavier it would be very hard to play, and if it was light the strings would become loose, so these ones strike the balance I need.
As always, D'addarios are high quality strings, so no problem there. It was only a matter of finding the right gauge, and this was the one. And adding to the fact that I have a Seymour Duncan SH-13 Dimebucker pickup on the bridge, these strings sound even more killer. Very happy with them