I have a 2011 F-Series 5610 with 1100 hours on it.  Had to replace battery connection terminal, 1 hydraulic hose end (my fault; wasn't paying attention and tree limb broke connector on end of hose), high flow solenoid (not too difficult), tires (sliced one on a piece of metal; so replaced all 4; 1/3 - 1/2 tread left on others).  All routine maintenance done on time.  Hydraulic tank has a leak.  I think it is where the hydraulic filter mounts onto the tank.  There are some nuts there that are embedded in the plastic and it started leaking after I changed the hydraulic filter.  Good thing is those nuts are high enough on the tank, that it only leaks when it is to the top of the sight glass.  I bought a new tank, but it is sitting in my shop, don't plan on installing it unless something changes.  That's all I can remember off hand, but it has been very reliable and I love it. Oh yeah, broke a fender bushogging and made a metal replacement. 
I use if for everything around the house.  Cut grass with it, till garden, lay plastic in garden, move dirt and rocks, box blade, dozer blade, rock rake, forklift, generator (made a hydraulic powered 12kw generator that lifts with forks), wood splitter (homemade), front mount bushog, auger for post setting and trailer hitch attachment for the 3 point hitch and as utility vehicle for going around on the land.  It has performed admirably for all I have asked of it.   Not the best tool for any one specific task, but it can do just about anything.  It is still going strong and gets used frequently.  Wish I had traction control like the G-series.  I am patiently awaiting the release of the next series and I will upgrade.  My hope is to be able to trade this in on an H-series (guess that is what it will be called) or to sell it while it is still good and buy one of the new ones.