Hi AS400
Just do a search on here for new owner pointers, there have been loads of threads about it.
But, as a general rule, from someone who bought one with every problem !
DSG - Mechatronic units fail, so if it jumps on idle, or kangaroos is probably a better description. Unless under warranty walk away ! Other than that they are solid and really amazing, much much better than manual !
Off topic slightly but make sure you put the aircon on cold and make sure it is freezing ! compressors go all the time in MK5's and is an expensive fix !