Pretty much in agreement with
MtnViewRanch; though I don't have our M8540 set up like that or even our
L5740. We have only two rear remotes on our M8540 as we
HAD to have it ASAP when our CX80 went toes up. I had more time when I bought our
L5740 and put three rear remotes on it. Under the heading "you never know as much as you should", I didn't get the float function on any as I really saw no need. Of course now I can see where it would be handy if not essential. It will allow your equipment to follow the terrain if you use it on your top link and if used on a side link will do the same using a scraper or blade; this according to other members since I didn't think to get one.
I have used the auto level on another tractor and while "handy" I couldn't justify the expense personally and don't miss it. If you can afford to, go for it. I get by with pallet forks for moving trees etc., but don't do a lot of it, if I did I would definitely set it up for a grapple.
I much prefer the Hydraulic Shuttle Shift over the Synchronized Shuttle Shift.
I wanted cast centers, but didn't have time to wait, so I get by with 1100+ pounds
ballast on the 3PH and loaded tires. I don't see the cast centers as essential, but nice for me at least. We have them on another tractor and it pulls like you wouldn't believe and is extremely stable.
I got Ag tires and mounted the rears wide as we have a lot of slopes. I got the big tires like on the M8540.
We put hydraulic top links on our tractors and would not want to try to live without them.
I am probably missing something sand will have to think a bit more.