I had an old pair of used 2004 k2 public enemies, they were indestructible. I'm not heavy but I ski fairly aggressively and I just couldn't damage the edge or base of these skis. The topsheet had gone to complete shit but that has no affect on performance. I've skied urban, bonked and stomped rails, caught edges, hit rocks, and trees but nothing has managed to move the edges from their place or damage the base. I stil have the skis somewhere in the garage and I plan to continue buying k2's because of how reliable they are.
Right now I'm skiing rossignol s4 Jibs. I was able to put an edge dent of 2 inches one the second day skiing these new skis. To be fair though, when I caught my edges I was going very fast to gap over to the rail and when I caught an edge I double ejected, so I think even the k2's may have felt that. However I was able to get them repaired and they havent faltered since.
I talked to a tech guy at my local ski shop and he said that rossignols are usually less durable than the k2's because they use thinner edges, and sintered bases rather than extruded bases and have weaker sidewalls. However the s4's are amazing skis and I don't plan on retiring them until they are either done or as outdated as my PE's.