I discussed my '03 Tornado Red Golf TDI earlier in this thread, back in August 2018. It now has just over 797k miles and lit up the CEL earlier this week -- probably glowplug-related, but is running better than ever with lots of smooth power and gets about 44 MPG on average. Its vitals are in my signature.
http://forums.tdiclub.com/showpost.php?p=5429866&postcount=64
I also mentioned my '03 Indigo Blue Golf TDI, which now has about 147k miles. My nephew was driving it in November when the turbo bit the dust, pumping oil through the intercooler, engine, catalytic convertor and out the tailpipe. I feared for the worst, but the engine died immediately from lack of air (IC filled with oil), and it cleaned up nicely with no engine damage. Now it's got a new VNT17, 3-bar MAP, Malone tune, cat-free downpipe and straight pipe. It runs nice but will slip the clutch if pushed so I can't do that yet. But it returned over 49 MPG on a holiday road trip to southern Illinois.
Lastly, this past summer I picked up a rust-free Candy White '03 Jetta TDI wagon that came from Washington by way of Texas. It had lots of issues that were unknown when I received it, and I've probably got over $8000 in it at this point. I'll know in another 300k miles whether this purchase was a good one or a mistake. Right now my sister and brother-in-law down in Iowa are using this one. The suspension is fine for now but I'll probably lift it a few inches at some point.
All three TDIs have VNT17s or the equivalent; all have Malone tunes and upgraded Bosio nozzles; two of three have VR6/G60 clutch/flywheel combos and the other will probably get that in a few months; all have Dieselgeek Panzer plates; all have Nicktane filter heads and Cat fuel filters. None are show cars but all are good runners.
I am not even thinking of buying any more TDIs at this time. But if I hear of any that look like they're worth owning I'll spread the word.