I've briefly used it in anger. Overall a significant improvement it seems, especially on the new iPad.
There's one disappointing thing, however, and it's the one thing I was really wishing for... The Enroute chart is still very blocky and lo-res, not very nice to read. I find myself using Jepp FD for all approaches/SID/STAR, and OzRunways for enroute reference... Or I just pull out the paper Jepp enroute chart and refer to that (crazy I know, paper).