I bought a set last year and installed them according to thier instructions. (after my metal ones got caught on the trailer) They ended up loosing and turned up not putting any pressure on the tips. This was my first ride out, I ended up burning up my new hyfax in one ride. Granted to say I wasn't too happy with my new $70 scratchers! I then put locktite and torqued them down really hard, harder than the directions stated. They were fine the rest of the season. however I did reinstall my boggie wheels also, didn't want to risk another set of hyfax. One thing I did find is when you hang them on your rails and ride in the powder all day the plastic on the cables like to freeze in the up position which doesn't allow as much pressure on the tips when you go to put them down on the icey trail. They work allright not as good as the metal ones. but I have bent up allot of metal ones by reversing over them when I forgot they were down. So I do like the reverse capability. They are an OK product still a little over priced in my book. Whenever they are stored on my trailer I put them down because the cable tends to bend over time. So I try to leave them in the up position as little as possible to retain the bend in the cable. Someone needs to figure out how to make the metal ones reverse compatibile....that would be the ticket. The big question is would I still buy another set. I don't know......Only if I was also running wheels.