I've had my '05 Passat TDI for about four months now, and I love it. I was a bit concerned that it wouldn't be as peppy as my '03 Jetta Turbo, but it has quite a bit of zip. Its passing power could be a little better though. You just have to plan ahead a little more for passing maneuvers. The back seat is huge for a car this size. The gas mileage is awesome, although it will drop in the cold weather. Also, it's a dog on cold mornings, until it gets warmed up. Overall, I can't complain. For the money, it's a very nice ride. Now I just need to get used to the funny looks I get from the truckers at the diesel pumps, and the station attendants asking me, "Um, you know that pump is diesel?"
I like the interior design / comfort, heated seats, trunk space, and great gas mileage.