Update - Been discussing more with wife about pros and cons and already leaning toward waiting and buying another mower when mine dies instead of trading for one tool for all jobs. Wife says I'm going to end up wanting to buy this size again anyway in a few years and I suspect she's right so no sense in starting over. I then spent time with my dealer Saturday.
He recommended that I don't do this trade because he agreed with my wife that I'd probably want another L in a few years anyway knowing my properties and hobbies. Instead he recommended that I don't just look at a BX for a second tractor/mower, but instead come pick up his GR and try that for my mowing needs as a cheaper alternative to a BX and a lifetime diesel dedicated mower.
I will try to make my JD lawn mower last another couple years and few months, then buy a BX or GR or at least wait until I'm close to having the
L3800 paid off. I still like the idea of the BX for reasons previously stated and would like to get a loader with it when I initially buy it, but don't really need another loader. But if getting the GR, there is no 3PH or loader options. Discussed with my brother and he told me to take dealer up on offer to use his GR to cut my lawn, then the following week take my brother's BX and cut the lawn and see what I think about both machines. For mowing, I'd say the only drawback to the GR from what I've read and what dealer has said is the deck is 54" while the BX can handle a 60". Maybe that's a pro also. I'll find out soon enough.
My dealer is awesome and I've said that before on here. I'll take some time trying to decide which route to go, but like the idea of a second machine also being a tractor instead of only having one function. GR is like $8,900. If spending that much, my first thought is why not spend a little more and have more functionality.