I would say they had some trouble with them. Our last 2388 was a 2000 model year and it had 3 new gear boxes put in it during the harvest of 04'-05'. One was a brand new one that went 15 hours. You want to talk about an expensive "upgrade"
Our low gear went out on a 99 model. Don't know when or how but surely from a plug. We found a burnt gearbox from similar machine from local salvage yard, Cook Tractor in Clinton MO. That was the best route for us for sure. Also, we knew our gearbox had a leak and when we pulled it, found it was coming from the dipstick tube that had a hole rubbed in it.