I didn't mess with the Axe2's shifter extensively.. but what I did do with it seemed pretty good - as in a lot better than most..
most pitch shifters really fall down when you go up an octave..
I thought the Axe2 was the best I'd heard in this area..
I really quite liked it...
the only unit I've ever seen that can change pitch really convincingly is the VG-99 [or something similar] with the hex pup and all the guitar modelling stuff...
this is the sort of unit that will re-tune your standard tuned guitar to anything.. DADGAD, open G, drop-D, down-D, banjo, 12-string, drop-C, bass, cello.. anything you care to invent....
but that's not comparing apples with apples cos it's a completely different technology and does not use a pitch shifter effect...