The (farming) guru I go to for advice told me not to buy this type of rake, I usually listen to him, but did not this time. I just couldn't afford a rotary rake that could handle 2 swaths of my discbine, but needed a wide rake to beat the rain. I went for the SR110 GII. His rake broke one day, so he borrowed mine and fell in love. It won't fluff up hay like a rotary, but according to him it does a much better job than other carted wheel rakes that he had tried in the past. He loved the fact that he could adjust the windrow width without effecting the total width of the rake. We have used the Kuhn in extremely heavy hay with no problems. I am a little concerned about using it in new Alfalfa fields, but that is a carted wheel rake thing, not specifically a Kuhn thing.
Two of my neighbours are supposed to be buying the exact same rake this year after seeing mine in action.
I can't speak for the other rake, but after two seasons with the Kuhn I cannot say one bad word about it.