Although I don't vote against a MM mower, you should put some thought into what holds more priority or uses for your tractor.
I had a MM mower for my first compact tractor. The new ones might be easier to roll under and attach, but it never gets easier with time. To be reasonably easy it needs to be removed on concrete or at least a level & smooth ground. I always had to get down under to connect the pto shaft and a couple of other hookups. Again, the newer ones might not be quite as demanding on your body. But they do take a little time and effort to hook up.
The MM mower always seemed to be left on when I needed it removed for other duties......or off when I needed to quickly go out and mow before the rain started.
The rear finish mower behind my B2650 goes on in less than 3 minutes and off in half that time. All while standing up. (No quick hitch, either.) It doesn't matter if it's dropped off on concrete, yard or in the woods......it's still easy to attach or drop off.
I agree you might save a half hour with a MM or zero turn while mowing a large area with trees......but how often is that extra half hour saved put to valuable use every time your done mowing? I find my mowing time gives me pause to comtemplate the next projects and their order, enjoy the outdoors, etc. But that's just me.
It also doesn't take long to get familiar with the RFM behind your tractor to allow mowing next to buildings, around obstacles, backing under overhanging hedges or clotheslines, etc. There's 19 or 20 trees to mow around in my rural residence yard and it didn't take long to come up with a mowing pattern that makes mowing around them both quick and efficient (if you have room). My roughly 2+ acres of lawn with the trees takes less than two hours to mow with the 5 foot RFM. Another 2.5 acre rural lot with about 3 rows of trees on it also takes less than 2 hours to mow at a liesurely pace with the B2650.
With all the other duties on our wooded acreage, mowing becomes one of the lesser ones. For me, the ease of the RFM attach/detach when using the tractor for other duties more than outweighs the little time that might be saved and used by mowing with a MM mower. I shouldn't have let the dealer talk me into a MM mower the first time.
A rear finish mower behind a Kubota hydrostatic drive tractor is certainly worth considering given all the factors and other uses for your tractor.
