One thing to consider is the track that you have. If your track has closed windows and no wear pads in the closed windows you hiperfax will be trash on the first ride. It will also cause damage to your track. The closed windows rub against the teflon and ball-up on the slide.
So, if you put hiperfax on make sure you either have all open windows with wear pads in each, or plan to drill holes in each window to install pads.
I have not seen a performance difference in the hiperfax at all, only longetivity.