Steve,
I have a 2520 which I just bought. It replaced a 4100 that was stolen. I've also owned a 5410 in the past (it was too big for most of what I do, though a wonderful tractor). I went for the 2520 instead of the 2320 to get the extra power, but they are basically identical other than the engine. I got the 200CX FEL, 62 inch mid mount mower, front plow (old one won't fit), and already have a tiller, rotary cutter, and box blade.
So far I really like it a lot. I got the iMatch system which makes installing 3 point hitch equipment much easier; however, not all older implements are designed to be used with iMatch, and I have had to do some "workarounds." (Still trying to get the tiller to fit, but I am optimistic).
There's not much I don't like about the tractor so far, though, admittedly, I haven't had it long enough to really shake it out. The FEL is easy to remove and put on, as is the drive over mower deck -- much better than the old one. I have used it so far for a little mowing, a little bush hogging, I graded the driveway, and moved a bunch of stuff around with the FEL.
Things I would change: the 3 point hitch arms rub on the rear tires when fully raised with the iMatch fixture on. The dealer is going to reverse the wheels to give a little extra clearance which should solve the problem. The smell of the exhaust is stronger than on my 4100, but that may be a function of the newness (I've only got 6 hours on it). I cross shopped Kubota and liked the JD better. I liked the JD hydrostatic pedal arrangement better, really disliked the way Kubota puts brakes and HST pedals on the same side, liked the JD PTO arrangement better,and thought the JD was smoother.
If you get the mid mount mower, the linkage arms will drag the ground when the 3 point hitch is fully lowered. There are some fixes. The cheapest is a little kit that allows you to easily remove the dragging hardware (or perhaps hold it up?). I don't know yet, as I asked them to order it after I saw the problem. It's a couple hundred dollars.
This is all based on very limited operating experience so far, but I am happy with the tractor. If I can help you with any specific question, please let me know.