All wheel drive wagons (estates)?

I note that the E500 all wheel drive wagon changed in 2004 from the 1995 model.

Does anyone have either of these in all wheel drive, and if so, do you have any problems with the all wheel drive, or the cars in general?

Any reason to think that a 95 or 96 would be more reliable than a 2004?

Likes and dislikes?

Larry