I have 2520, and was very confused before I made my purchase whether or not to go with the independent lift, primarily, because I had never heard of it before and didn't understand exactly how it worked, or what advantage it would be to me. One particular salesman was quite adamant that "it was the only way to go" and suggested that I really should add it. Yea....great idea for him, pushed up the price of the sale.
After a lot of research on it, and finally understanding the differences between the independent lift and the mechanical 3pth lift, I didn't get it and opted stay with the mechanical lift for the MMM. I wanted to be able to have the use of the loader, and the MMM at the same time, in some instances.
If you get the independent lift for the mower, then in order to use all the functionality of the attached loader, you either need to switch out one of the hoses, or go to more expense, and add the diverter valve. Using the mechanical mower lift that works off the 3pth lets you have full control of both loader and deck height at the same time without having to change any hoses or even switch out a diverter valve.
Granted, this way, the 3pth is now moving up and down with the deck but I thought "how many times would I want to use a rear implement along with the mower......in my case never. I currently only use a ballast box on the rear, either with the loader, or when I have my front blade on, when snowplowing. If I ever plan on ever using a 3pth implement, I don't think I would want the mower deck on at the same time anyway, so that would completely free up the 3pth.
I don't see any tangible advantage to having the independent lift, and for me, in Canada, it wasn't an inexpensive option, once I added the diverter valve along with the lift kit. Switching out a hose connection every time I wanted to use the loader with the deck on, even though not a big deal, didn't appeal to me. I'm sure glad I did my homework on it and didn't just go along with that first salesman's advice. The more I think about it, I don't see how the independent lift would be that much advantage to anyone, when you consider the added cost involved.
REV