I have a set on my wifes sled and my sled.........they work well! My only minor complaint is that you have to use the Velcro strap on the end of your handle bars or a plastic "rivet" that pushes into the end of your bars and if you have to grab your bars quickly for some reason it can be a little tricky as you can not grab the very end.
We both have the smaller ones, I believe they are called the Pro series.
Over all work good and worth the money! Rode all weekend and would not have wanted to be with out some kind of hand guards.
I saw Yamaha is selling them in their accessory catalog this year.