I agree that, unless you're playing with other people (and sometimes even if), you can tune up, down, or alternate. I was just wondering why anyone would want to tune the top two sets a flat apart (B Bb, E Eb) as per wolfz's luthier?

(Yes, the lower four sets are an octave apart, top two sets same octave)

I've also used several different capos over the years and cuurently prefer the Kyser 12-string capo.