I haven't...the first I've heard. I think people go into them with a prejudment that they won't like them. Either, they can't admit that they are great mountain sleds or they don't know how to ride...also most powerful. I mean it, they don't know how to ride. Think about it, if you are a good riding you should be able to ride anything...I understand people will say I don't want to ride a heavy sled in the mountain because they will be worn-out by days end....and other don't include them in mountain sled talk...also, not to be able to see any good from a 4 strokes sled. So, I find my self riding the trees, in the step and deep, with no problems, and no getting tired or worn out...while others watch...and then I'm told, "WELL YOU HAVE A TURBO". Please. That's why don't value their opinion.