I have been very pleased with my 2013 - S77.
I would rate factory ass'y and dealer PDI - as great!!!
Have had only two stops in field, in two seasons- 1st season - within 1/2 hour of using pick-up header, had a squeaking noise coming from header. Took 5 minutes to find table auger was touching strip on back of header - nut was loose on fore/aft adjustment, took a couple minutes to adjust!
2nd season -(not a Gleaner issue) chain on plastic shield on pto shaft on Honey-Bee header came loose and whacked the power cable for headsight. Was only 1/4 mile from yard, so quick wire slice and a couple cable ties and we were going.
Have had two other issues that did not stop us. 1st - reel was slow to engage and auto reel did not function properly - replaced valve cartridge after first season and it is good now.
2nd - would get about 6 communication warnings, at same time, about once a day, would just hit OK to them all and kept going, never stopped. Dealer posted pics of all grounds on there web site and had me check mine. Has been fine ever since!
In the off season dealer tech did following
After first season - replaced harness in steering column, a kit in seat to secure wires and new bumpers, change in mounting of AC comp, checked feeder slip clutch for missing springs
After second season - replaced bolts in unloading auger in grain tank, installed heat shields on exhaust manifold and re tightened brake drums