I'm a fairly new 2520 owner. I started looking at the 2210 then decided to wait for the 2305. Ended up with the 2520 mainly so I could use a rotary mower at my father's in place of his Ford 8N. I have the 62d drive on deck and its very easy on and off. Takes a few minutes, as I leave the FEL on, and you need to remove this before you drive over the deck due to the weight. So, you remove the FEL, which is quick, then move to a new spot to remove the deck. This is so you can then back up to the front of the deck and lift it up with the I-Match to move it to the storage location - very slick. I have the ballast box, and use a back blade my father had for his 8N but doesn't use.
I've used it to remove the 5 inch snow we had, and back in the woods to clear some trails, etc. Love the thing and am glad I moved up from the 2305. I think the 2305 is a great machine, and you won't go wrong on whatever you get. Happy to answer any questions you may have.