The add on steel tracks are very heavy, and can really bog a machine down. You wont be able to push as much dirt around, even with the added traction. Also, if you get to turning in gravel or stone there is a good risk of snapping the track bolts. But on steep grades, they really help weigh you down.
I had a takeuchi with rubber tracks, and i really liked that machine. It left far less rutts than a wheeled machine if i was careful with my turns. The rubber tracks didnt pull up mud either. The big drawback is that the rubber wears out really fast running on concrete and blacktop.
I think i've run everything except maybe a john deere.