Here is a link to some info but to sum it up real quick, DSG is an Automatic with the option of telling the transmission to shift when you want. As for the quality of the DSG....many dot like it because you have less control of a manual car but it does shirt faster than a manual car. The tranny spins two gears at the same time so when it shifts, you dont feel it but you hear it.
http://en.wikipedia.org/wiki/Direct-Shift_Gearbox





