Oleg. I have to speak from my own experience (40yrs on the snow). When I decided to really get off the groomed and quit racing-the powder, variable conditions, trees etc. became a real challenge and really rejuvenated my interest in skiing (50-80days a yr). However I will admit I struggled and progress was slow (and mostly a mental thing in powder). As an example/in the trees I would pick a place to initiate a turn, execute at that spot and then ski bye the next tree/gate. I skied this was but was not happy with my progress.
Primarily because of what I read here on Epic regarding rockered skis I bougth some S7's 188 at Starthaus. The lst day I turned them down the face at Lookout (no trees) in about 14 inches and immediately fell in love with skiing again. Since then my S7's have been heli skiing , cat skiing and now in the trees I ski like this-See the gap-ski it right now, no setting up the turn-just do it. The ease and confidence these skis gave me in powder is really amazing.
So much so: I now have my S7 188's for Cat/heli and over 8 inches and I just bought and will mount shortly a pair of 12/13 S7's 178cm with Atomic Tracker AT bindings for my BC, sidecountry skiing and trips. I went a little shorter for the infamous variable conditions I get into off piste in the BC and sidecountry
I am 200 lbs and wouldn't rate myself a charger anymore because of my age but still ski ok.
I really can't overstate my opinion on what these skis did for my powder skiing. I also wrote a review here on epic on S7's which you can access. Good luck let us know how you do this year. Pete