Power Rakes

I was just introduced to the concept of power rakes. I have 18 acres, about 60% of it is open, rutted and a bit rocky. As I mow it with my JD3720 and Frontier RC2060 cutter, I am constantly (and I mean CONSTANTLY) being rolled, dipped and moved about in the seat. Anything over about 3 mph is unsafe as I can either be thrown off (yes I wear my seatbelt) or the FEL is being banged around due to the ruts, etc. After mowing, I am physically tired from all the gyrations. Even at slower speed, I am still moving about in my seat. Would a power rake be the implement to smooth out the ruts and give me a new surface to deal with? I am also wondering if those that do have a power rake use it truly enough to justify ownership, or is it something that would best be rented? Even if it is used for 20 hours (3 days of use at say $200 a day) it is not a small investment. But for those that own one, do you find that you are going over the same areas to maintain your grounds as erosion and other things have a tendancy to change the landscape? If that is the case, ownership is not out of the question for me, it's just a matter of practicality. To me it looks like an implement that is used more by landscapers to initially smooth over an area of ground. I'm just wondering if it is something for a landowner to also use in day to day or even month to month operations.

Thanks for any input you can give.