Better for heroic.
Rogues can use vanish and then ambush to get back on to the belt, and shadowstep. If a rogue has Assurance of Consquence higher than 561 ilvl, they can take every belt. Particularly OP for heroic.
Hunters can stand on the nearest most pipe and disengage on to the pipe.
Mages can use Alter Time when you are about to get pulled off, and end up back on the pipe.
Better for heroic, at least. Can build a stable belt group.