I've had the VAGCom setup since about 2010 and to be honest for the money its the closest thing to the dealer tool you can get. The great thing with this setup is that once you buy the GENIUNE Hardware cable the software and all future updates are free. VCDS Or VAG-COM is a fantastic piece of windows based software and hardware created by Ross-Tech over in the states for VAG Group based motors.
Ross-Tech VCDS HEX-V2/HEX-NET - Fixing a failed firmware update (see bottom of post)
Ross-Tech: VCDS: Downloads: Current Release and Manual