We have 2009 4320 HST open station, none of that power match stuff, with loader at the orchard. Was bought used from a perennial nursery for 21k back in 2011. Had 600 hrs when I picked it up and towed it to the job.
Have over 1200 hrs now. Hard hours too, daily commercial year round use, multiple operators etc.
It has really been a reliable machine so far.
The only mechanical issue was a water pump failure at the start of the 2015 season and I put a new one on back in May. Straight forward job and pump price wasn't too bad either OEM part.
Other than that just routine maintenance oil grease and fluids and still the original battery.
Bunch of other small stuff numerous broken flasher lights, broken steering wheel adjust springs, broken seat slide adjuster handle, seats all cracked now, broken pins and lost several stabilizer adjusters halves for lift arms. Ripped off hydraulic 4WD indicator switch with brush made a big leak. All these...operator attributed.
I like operating the machine. Its the most popular tractor with all the help.
One quirk the 4wd engagement lever is in when pulled up and often it drops back down to the disengage position. I have yet really discern if it its simply being hit by the operators arm or the shock of bouncing around thru the orchard. Anyhow its scary thinking your in MFWD and you find out your not on our hilly terrain and towing a wagon. Good thing there's also an indicator light on the dash.