I bought the RR two years ago and put at least 30 hours on it. I use it on my little Kubota BX 2660. I can tell you, this thing makes the little BX do the work of a tractor twice its size. I use it for leveling gravel on our driveway. Saved me hundreds of dollars for new gravel, because it tackles stuff my box blade can't.
I also have a concrete patch that had about 50 smaller and larger trees growing out of the cracks, from way before I bought the place. I used the RR to push the trees over and peel the roots off the concrete. I think, on that job I abused the thing as much as I can imagine.
In several overgrown weed and brush areas I used it to rip out brush. Works very fast. Of course, it doesn't leave the area completely clean, but my landscape rake can handle the rest.
Lastly, I use to push over trees. You wouldn't think that little BX can do any big trees. Well, with this rake it can handle most trees up to 8 inches or so. I usually take a little run at it. With a smooth bucket I wouldn't dare to, but the teeth on the RR prevent the bucket from slipping and after a few runs the trees usually give.
Anyway, I love the thing and would recommend it to anybody.