Owner of K2 owns Line and Full Tilt I think and another good handfull of big brands like that, but besides the $$ ending up in the same place they have no simularities(NONE, totally different brands). Disorderly's are much much much better than Invaders and Anthems, no comparison at all.
Now that the worst part of my hangover headache is over, here are some reviews that are somewhat what I felt: http://www.buzzillions.com/dz_1398789_k2_disorderly_skis_2009_reviews
and I thought they were good at butters, didn't get a chance to really ski them, but they are liked. I would say get Reno Jibs though if you were mostly looking for something symmetrical and good at rails/butters.