J_Scott wrote an answer about K2 SideSeth Ski on December 19, 2012
Jonathan, I'm 6'3" 200lbs and I'm running the 188's no problem while skiing in mostly West Coast backcountry powder, but also on Whistler's groomed/chopped runs later on in the day. The more traditional mounting allows a lot of ski out in front of you and the stiffer tail allows more control in the rear even if there's less ski back there.
I was a little concerned that it would be too small for me since Seth (as he mentioned here) rides a 188 and I've got 5 inches and almost 50 lbs on him, but I'll admit, I'm probably not "quite" as good a skier. ;)
Good job on this ski Seth!