I just did the switch over to the Legacy myself...
Personally I did not have nearly has much adjustment time. That might be because I only started riding last year. By my first run down I had it pretty dialed in.
Personally I love carving and charging on this board. I can go confortably way faster on this board than I could last year. Additionally I find making the switch from edge to edge just super easy. On super steed stuff, where last year I would feel hesitant to link that turn, I really don't have that anymore. I know that with this board, if I want it to turn, it'll turn right away.
I also agree with BA, where you can pretty much stteer under your feet, which really helps me do a lot of hard carving going edge to edge.