All I know is that reading the TGR post makes me:
1. want to buy a pair of the 179's even more, regardless if I really need them or not
2. want to go skiing. Now.
I am curious how the PM guys come to their lengths, though. I generally have a quiver that is in the 175-180 range, but a 185 would be appealing to me as a powder ski (the 188 just seems a bit too long and I'm not even gonna fool myself into getting on a 192).