1988 Jetta GLI (heavily modded)
1995 Cabrio
2004.5 GLI (stage 2)
2003 20th AE GTI (stage 2)
2012 GTI (stage 2)
^^Those are what I've owned over the years. Never had any major issues with any of them, but they were all maintained properly (well the Cabrio wasn't until I bought it, so it needed some maintenance work at first).
The biggest "issue" was my clutch slipping at 20k on my current GTI....but that was after going stage 2, so I expected it. Loving the new SB clutch much more than the stock one anyways.