I got my 68" RR at Tractor Supply for $329, but used TSC coupons and credit to cut that by $50. They are $299 to $359 on the RatchetRake.com website.
I've had mine for a few weeks and it certainly meets expectations. I have a real problem with multiflora rose and autumn olive and the rake just tears them out. I took out a 5inch trunk autumn olive easy, of course the ground here is soft with recent rain.
It is not as neat as seen on the video with a skidster, I have a JD 3038e, but it does work. After you drag the stuff out to a pile, you can tilt the rake and scrape the ground for seeding.
I have also put the bucket flat so that the lower teeth hit the ground and run across areas with lots of low honeysuckle. Tears it up nicely... So that a little brush killer will work even better.
It also is handy for quick repairs to potholes on my gravel drive. I haven't found it as useful for grading, but others might with different stone.
Good tool.