I too have a set on my Pro / 163 with an X3 and they work great!!!!!
Running down several different trails, some being packed more then others and the highest temps I've seen so far, has been 129 degrees on a steady run. Most of the time it's in that 125 to 127 for a normal trail at normal speeds.
As far as the reverse feature, this does work very well too. in the parking lot or on the trail, I have not had one issue with using reverse.
These will now be one of those automatic purchases when a new sled arrives!!
Yeah, I have sold more of these than any other brand scratcher and I sell several brands.