I've gotten a great finish cut out of my
BX23 w/60" MMM going on 4 seasons now. I rank it as good or better than any of my previous dedicated lawn mowers and L&G mowers.
When setup right they perform very well.
The keys to a great finish cut are:
1) Have the MMM setup properly. Makes sure the front to back and side to side measurements are done at the blade tips and not on the frame of the MMM.
It's alittle bit of a pain to set them up as you've got to crawl around but once you get it right it generally stays that way. The owners manual is alittle hard to follow but is right on.
The side to side measurement should be within 1/32" and the front should be approx 1/4" lower than the rear. Surprisingly mower's perform better this way.
2)Proper anti-scalp wheel settings. actually, I'm breakng this rule some as I run mine a notch higher than what Kubota specs. At a notch higher they still provide their function of lifting the mower over bumps and rises ( preventing scalping) but they don't make "unecessary" contact with the turf in turns and straightaways. Since I mow at 3 1/2" the lawn looks pretty good and doesn't show all it's imperfections (which are plenty).
3) Proper air pressure. No matter what psi you run the tires, makes sure that the two fronts are exactly the same as well as the two backs.
I run mine approx 3 psi lower in the rears inorder to cushion the bouncing and this does pretty good. Course I had to compensate for this in the MMM setup but it wasn't too much of an adjustment.
4) Lighten the load. If you want the lawn to not show ruts and tires marks as bad then you need to lighten the tractor & mower up. In finish mowing, the lighter the better. Removing the FEL when finish mowing not only makes the tractor lighter by nearly 400 lbs but it also increases manuverability. That power steering and HST makes a BX VERY nimble when it's configured to give it's lightest and smallest footprint.
5) Good blades. Good sharp high lift blades defionitely out perform dull or bent or std lift blades.
In any case, there has been a few posts over the yrs where some have been dis-satisfied with the finish cut of their BX's but the vast majority of BX owners have posted great results with theirs.
Good luck