I have them on two sleds, seem to work fine. From what I have seen the hyperfix are much better and last longer. The price is high, but if you ride a lot of miles, they are probably worth the money. I only ride each sled less than a 1000 miles a year, the graphite suit me well.
For the $1.00 (can) extra each over the cost of after market, it might our might not be a good deal. I find that they give about the same performance as factory plus or minus 100 miles. If you are paying original equipment prices or higher stick to the after market sliders.