i tune flat (half step down) but its cuz i feel like the strings give a different tone (one i like more) due to the difference in the tension. having the low Bb is nice, but i dont use it as much as i used the open B when i had it. i feel like when i had the open B i was always so tempted to hit double stop chords over it and stuff, now i use it far less. the open Eb is actually more of a cool thing for me, but it also doesnt really matter in a way. lol it's hard to explain how i feel about it