I had a DSG on a GTI... worked fine until the 40k service.. (oil change).. after that it became sluggish, made hard dowshift and became UN-usable in traffic..
No single VW dealer were able to fix it, just proposed me to change the entire tranny for 5k (out of warranty)
I traded the car for a new one with a manual..
and I am not the only one having problems with DSG... (vW admitted that there are more than 300.000 complaints of broken DSG)