I've got the wire style on my sled and the Duraflex on my wifes. Both RMK's with 2" tracks. I only put the ones down on my sled maybe 1 time per year. I have my wifes down all the time because I don't expect her to look at the temp gauge ever to see if its running hot, thats why she got the Duraflex models on her sled.
I do have a new RMK coming this yr and I do think I'll put the Duraflex on it but may never put them down. And I may need to get another set for my old RMK as that is going to the kids and I suspect that, like my wife, they'll never look at the temp gauge either.