This year, I bought the 3 sleds you see in my sig.
The '95 600 came from a good neighbor, who after a month of dickering, wouldn't budge off his "best price". This sled has 1.5" paddles (brand new track) and PLASTIC SKIS. Both were installed by the local dealer, who knew how to get 1.5" under an old VMax.
Anyway, the neighbor was really adamant about the value of the new track and the PLASTIC SKIS!!! The skis "would be like night and day for me, much lighter than the factory skis so the sled wouldn't be so heavy in front, much better flotation, no darting, and just better overall performance and handling." Great! I finally bought the sled from him.
So now I ride all three from time to time. Here's my opinion, especially after removing the factory skis from my '94 sled to replace the skins:
1 - the factory skis are not heavy. The plastic skis are definitely lighter than the factory skis, by about 3 lbs each. That's a total weight savings of maybe 6 lbs off the front of a pig-heavy fat-a$$ old vmax. If 6 lbs is the only thing keeping a rider from having fun in the powder, then lemme lemme tell you, it ain't the equipment, it's something else...
2 - None of my sleds dart after I put the 10-minute, zero-dollar shim-made-from-an-old-belt mod under the two factory-ski sleds. So darting is a non-issue.
3 - the handling on the other two sleds is much better than the plastic skis. The other two absolutely rail on the trails. It's scary. You hit a corner hot, and they are going to make it, with or without you. The plastic-ski sled does not rail. It pales (in comparison). In deep powder, I have almost hit trees a couple of times because i got used to turning one of the factory sleds, and then switched to the plastic ski sled. The plastic skis just don't grab a turn like the factory ones. All have good carbides. The real reason is because the plastic skis are pretty much flat on the bottom, while the factory skis are V-shaped. This v-shape offers more runner pressure on trails, and more vertical profile friction surface in powpow.
4 - flotation - who knows??? The plastic skis are a bit wider than the factory skis. Combine this with the 6 lb weight reduction, and you gotta know that flotation is somewhere between 1% and 15% better with plastic. But honestly, they all float good if you keep them moving. It's stopping in the bottom of a hole that usually causes flotation problems.
That's my personal .02 on plastic skis. YMMV.