After owning my Golf for three months, all I can say is "wow." The Golf TDI is deceptively powerful for only having 100 bhp. I can climb I-70 mountain passes in 5th gear all the way from Denver to Glenwood Springs without shifting. It is incredibly fun to drive and it handles very well. The GLS model is definitely one to hold out for, heated seats are a must for Diesel engines (that warm up slowly) in cool weather. The ESP Traction Control system is very, very good at keeping the car pointed where you intend. The Monsoon sound system is one of the best balanced sound sytems I've heard in a car.
The lifetime average of 42.5 mpg! I've gotten as high as 50 mpg. My last tank of "city only" driving got 40 mpg!
None that wouldn't hurt this car's performance. The road noise is a little higher at highway speeds than I'd like, but this is a small, lightweight car.