The responses on this thread certainly tend to show that MOST people profess to be happy with what they actually did, whether it was buying or not buying.
...reasonable points on both sides and I guess that I am no exception; I bought my B7800n with a subframe mounted Woods 7500 and have NO regrets at all either about buying the BH or buying the largest one that my tractor could handle.
Boy, has it been useful! So far, I have used it to dig stumps and uprooting sapplings from about one half acre of very thickly overgrown back land. I tried doing some of the sapling removal with the FEL, but it is MUCH faster and easier with the BH. Digging the stumps might have been possible with the FEL but would have taken many times longer than the BH and put a hell of a lot more wear and strain on the entire tractor. I cleared this land of all but the large trees that I wanted to keep in a few weekends. Without the BH it would have been a most-of-the-summer project. ....unless, of course, I rented a BH and if I made a habit of that, by the time I get done with the remaining 2+ acres (not to speak of the 30 waiting for me in the Berkshires) I would have paid for the BH without owning it).....
This summer, I plan to use the BH for excavating a small (1200-1500 sq. ft.) landscaping pond. If my polebarn site has too many or too large boulders to dig the holes with a PHD, I'll resort to the BH. Since it has already extracted and moved 2' diam boulders without undue difficulty, I am hopeful that it is all I'll need as backup for the PHD and for the FEL when digging and grading the area for the floor slab.
I expect that the amount of my use of the BH, to say nothing of the convenience of being able to use it when I want and for as long as I want on any particular day, will largely return my financial investment in it within 2-3 years.
The "cost/benefit" analysis of buying a BH involves a personal business decision as to the deployment of substantial financial resources. I think that this is a matter for individual judgment for each of us, in light of our own resources and priorities and there simply is no "correct" answer to whether it is sensible to buy a BH or not. Only one of my children is still in college and my wife and I have no substantial future expenses to consider other than our own financial security and eventual retirement. If buying a BH compromised either of those, I would hope that I wouldn't do it.