skiied my friends phil belanger pro models way back when and those were some awesome skis.
from what ive personally owned, the 4frnt stl (white topsheet) were one of the smoothest feeling skis ever, in the way they skiied and buttered, like it felt like the skis flexed in slow motion.
the 2nd year surface watch life had such a great flex, medium stiff, poppy tails, and pretty soft tips, super light. they were about as stiff as you could get while still being able to call them a buttery ski.
my favorite of all time though would easily have to be the original kung fujas, they just nailed the shit out of it with that ski. 95 waist was perfect to still be a great rail ski (learned 450's on both ways with this ski and pretzel 270's. progressed my rail skiing more than ever on these) but wide enough to be super stable on jumps. the flex was fucking perfect, everything about it, how soft/stiff they were, how much and how soon they stiffened up as the ski's flexed more, where in the ski they flexed. they were soft enough to butter around all day long, i remember you could get them into a nose butter real easy, once you were well into the skis flex they stiffened up a good bit and you had this like platform you could pop off of, so nice for spinning out of nose butters. the width and length allowed them to still be amazing on big jumps and still be softish. the nearly flat camber made them crazy poppy and prevented them from being catchy. and just the feel of the ski, had that smooth, damp feel that gave you lots of confidence charging through stuff and hitting jumps in meh conditions.
im a big fan of rockered skis, but IMO they ruined the kung fujas when they started giving them dual camber, and again when they went to 102 waist it stopped being good for a park specific ski. if k2 brought that ski back i would buy like 10 pairs to use for the rest of my life.
