A friend of mine was doing research for an oil company in Louisiana and his company rented a Hydratrek for the two weeks he was there. He said that after hours they'd go play in the beast and it was very capable. The only machine he'd ridden in before was a Superchief and he doesn't think the rental was quite as fast.
Stuck in the seventies- not in the swamp.
(6) Attex, a Hustler, a Super Swamp Fox, (2) Tricarts, (3) Tri-sports, a Sno-co trike, 3 Dunecycles, and a Starcraft! ...so far