I'm surprised no one has responded to your message although I don't have a 5220 I have a 4520 awesome little tractor if you want a review on a 5220 go to youtube and type in mechanic Dave he has several videos of a review on the 5220.
I just purchased a 5220r with fel on Friday. It had 1.9 hours on it. I don't have much seat time yet. Maybe 4 hours. So far I am very pleased with it but hopefully I can tell you more after this weekend.
The 5220r is the same tractor as the 4520r except the 5220r has the turbo.
I feel like I got a good deal from my local dealer. I had been looking for the 4520r but he didn't have one on the lot. So he sold me the 5220r for the same price as the 4520r. Mine also has the Tier 3 emmisions.