Been playing E flat for a few years. The cold weather has caused some tuning issues so i tuned back to A440. Strings are D'Addario .011 to .056, im digging the tone but there's a bit more tension on them now. My 74' SG with a Bigsby stays in tune better @ A440. So far im liking it. Had to go back to 5 springs on my trem guitars.