I had one for my JD650 for 20 some years and did a lot of work with it, more than paid for itself. Bought my new JD2320 in 08 and my wife convinced me to buy another one for this tractor.
Here is the deal, when I bought the JD650 I could not afford the BH but needed it and bought it. Come to find out I could not afford to not have the BH, saved a lot of money early on. Now that we are established in our life and property I don't really think we needed to have another one but we had the money, funny how that is. I have not used the new one once since we got it. However I do plan to use it some this summer. I would say it depends on your property and setup.
The problem with a BH purchase is you can never justify it until you have one and on the other hand you will make a lot of work for yourself by just owning it. I do not regret the first purchase and I do not regret the new purchase. I will add one more point, Resale, I traded my 20 year old 650 with FEL and BH in for my 2320 and the 650 was on the dealer lot for two (2) days and it was sold.
I bet this makes everything clear as mud!!