Big mountain doesn't just mean deep powder. Having lived in Whistler for 8 years, I can ~garuntee~ you, even on powder days, you are going to come across all sorts of snow. I have been on XXXs for the past few years, and on Scratch BCs (85s) last year as well. The XXXs were fantastic, as they had great float in the powder, but could still hold and edge and leave rail road tracks in the hard pack.
Not so good with that weird icey crap that you get with really damp powder when it compresses and gets all grabby, but what can you do? At that point, I'm just straight lining to the valley for the beer run anyhow.
B3s are not as turny (or the last model wasn't anyhow - have not been on this year's yet) though they have good float and are reasonably responsive.
I have found lots of Park/Big Mountain skis are too centred for just deep snow. Yeah, you can do it, but its not as good as a dedicated out of the park ski. The difference between my XXXs and Scratches was enormous, even though they have very similar footprints.
Being a big guy (6'2, 210), I found the Pocket Rockets a bit soft and skied a bit short for me - if you are sized more like Mike D, maybe you dig that though.
With sometimes 150 days a year on snow, there may have been 2 or 3 that I would have taken a swallow tail out for. You got 4 other sets already? Giver. Just having one - don't bother.
'The money's in the medicine, not the cure!' Harvey