We had a set on a Case 95XT. They definitely did help, but don't get the impression they float you like dozer tracks, they won't. Great for in muddy places though, beats pawing and spinning tires.
One thing we did do, was foam fill the tires. One particular job where we did a lot of turning in a 14' culvert cleaning sediment out of.., it popped the tires of the rims like 3 times. Foam filled, and never had another problem.
And heard it is best to run a little slack in them, as it's tough on bearings if tight. Mud and fine debris only make them tighter.