I've used the rubber-over-steel tracks on a Bobcat S250. They make a world of differerence in the mud, where a normal skidsteer is useless. The rubber pads are pretty much wore off now and I don't know if I want to pay the $ to replaces them. Besides I'd probably have to cut the studs off with a torch they're so peened over. But since that machine rarely leaves the yard (I have an A300 that gets the majority of on-site use) or is used on only muddy jobs...the metal track is probably fine.
I will say, though, that if I had to do it over again, I would have just gotten a true track machine instead of the track-over-wheels set up.
I have an ASV RC30 machine that is a beast (albeit tiny) that will go anywhere and still not damage the turf. Due to the machines ability to not loose traction, the break out torque is crazy. I use it frequently like a powered pry bar to pop out shrubs and trees and boulders. Due to it's small size (about 3K#), though, it can't lift alot like the larger machines.
But I can only imagine what a larger track machine would accomplish