I think you will be happy with your purchase. The 2520 is a solid machine. I have the 2320 and tested both machines quite extensively before buying. I can say for ground engagement tasks on my property such as pulling box blade, rear blade and loader work, the 2320 was the equal of the 2520, if not even a bit better. It is a more manuverable tractor. The key advantage of the 2520 in my view is its hydraulics. The 2520 will not lift any more than the 2320 either via loader or rear three point hitch, but it has much faster hydraulics. Loader cycle times are much-improved with the 2520 v. the 2320, but that did not matter too much to me this time. As for the two range hydro, my 2320 will not do much work in the high range, neither will the 2520, but both machines will move along pretty well in A range and have all the power one needs in that range. I have not been disappointed so far in the indirect injected diesel in my 2320. It has ample power and uses very little fuel. I have had direct injected diesels in my 3000 and 4000 series machines, and can say the increased fuel efficiency is more theoretical than actual. They also seem to emit more strong diesel fumes than does an indirect diesel. That said, they are torquey engines and run well at lower RPM's. Any of the 2020 machines are significantly upgraded v. the 2305.
In short, I recommend to folks looking that if loader cycle times are very important to them, go with the 2520; if not, the 2320 will do the same work for less dinero. Again, one problem I have with the 2000 series machines, especially the 2520 and 2720 is their price. Both approach the price of the lower end 3000 series tractors, which have more features and capability, making them difficult to justify. When I was looking most recently, I really wanted a 2720. I ultimately found one, tried it for a weekend, and took it back while trying the 2320 I ultimately bought. In the meantime, it sold, and I could not find another locally. They simply are not stocked around here because they are not too popular, but in truth I would have bought one had I been able to find one. To me, 7 HP and 6 PTO HP merited the difference in price. I personally would have been hard pressed to pay the additional for 2.5 HP both flywheel and PTO between the 2320 and 2520. Most folks at the price for the high end 2000 series step into the 3000 series. This is less notable--but still present-- with the 2520. They are good machines, though, and yours will serve you well.
John M