I purchased my Golf new in February, 2001. She's up to 338K miles now and still runs perfect.
Repair wise, I've had to:
Replace the clutch
Replace the Alternator
Replace the AC compressor
Replace the Heater core
Replace the EGR
4 timing belt jobs
new lifters
lots of oil changes
New Paint
Many tires
new Control arm and sway bar bushings
new suspension @ around 190K
I'm sure there's more, but those are the biggies off the top of my head. Still, it's been amazingly reliable over the last 15 years, and I'd do it again if I had the choice. The engine is really great in it. The TDI is a wonderful motor (at least, the ALH is), and the mileage is a great perk.
The car is starting to feel its age a bit... various squeaks an rattles are appearing. The fabric on the door cards is dead. I need to recover them at some point. The headliner is just starting to fall at the front of the car. I'm also finding that I'd love to upgrade the stereo to something a little more modern at some point.
I'm really nervous about upgrading from this vehicle to a new one. Will a newer VW be as reliable as this one? Will I like them as much? I have no idea, and if I take the plunge and find out I hate the new one, I'm out my wonderful mk4. Who knows, I may keep it forever!