they came from the factory on the s and zx chassis sleds and held up well in them, i put one on my 2012 xp and now have one on my 2015 xm, i like the adjustability, takes a min to let the limiter out for rough trails or playing around, or tighten up for deep snow/hill climbing, its pretty cheap and eliminates wrenches for adjustment,
We installed the adjustable straps that you adjust from the side of the tunnel on a cuople T3s this year. They work fine and are holding up good so far. 7-800km on each sled.