Mine were new Taller Haulers and lasted only a couple of hours. They were fine after cruising the dunes for awhile, but a few trips up Comp and four blades were ripped to shreds. When I took them to Skat Trak to voice my displeasure the gentleman there told me to never run these on the DS, that they weren't designed for the weight and the torque output of the DS. He highly recommended the Extreme Haulers.
The Extremes looked to be more durable and designed better but my opinion is obviously tainted at this point.

These Sand Gears look to have very thin and tall blades and I wouldn't risk my $.

22" Sand Stars all the way for me...

Anybody that wants my repaired Taller Haulers PM me and we'll work something out. They are in very good condition. Just don't put them on the DS, IMO.