I have an 03 or 04, and have had precious few problems. Very capable machine, the few horror stories you read on TBN are a rarity for this tractor. I have 620 hours, and it is still a tight little dog that wants to work. Couple obvious things to read up on, things you MUST do with respect to maintenance to avoid some of the stories you've read about--
1. Know where your HST fan is, and make sure it's whole, not broken. Way up underneath, right in the driveline in front of the transmission. It's white plastic, you can't miss it. Recommend you remove the inadequate factory guard, and weld on a little extension to protect this fan from being destroyed by a stick. One stick poking in just the wrong place will destroy this fan, but you can prevernt that with a small guard extension. Meanwhile, don't run over sticks that are pointing up unless your deck is on. (If your fan is broken, it's priority that you read up on this, several methods of replacing this part.)
2. In that same driveline, locate the F & R U-Joints. This is on the main drive shaft from enge to HST. One Ujoint right in back of engine, really ahrd to get to... and one Ujoint close to Transmission HST, also hard to get to. You'll struggle to find this shaft, it is hidden pretty well. Grease the Ujoints once or twice a year. They will be a ***** to get to. I cut a hole in my floorboards (to match the size of the Deere plug) so it's easier to do. Easier with a long grease needle, read some other posts on here and you'll find all info needed. NOT greasing them will eventually cause a major epic failure of these Ujoints and be a time-consuming repalcement job. Or paying someone at Deere a pile of money to replace them.
3. read all you can on these and other problems. Knowledge is power, knowledge can save you hours of needless problems.
Good luck and enjoy your machine.