I just read James Deakin's article on the DSG equipped A3 turbo last week. The A3 turbo is rated at 140hp and when Autoplus dynoed it, it showed 140hp at the wheels!

Is this the holy grail of transmissions or what? To boot, shifting takes only about 8ms, even faster than a Ferraris!

From wikipedia

Advantages

* Extreme fast up shift and downshift time of 8 milliseconds
* Practically no power loss whatsoever, because of the short shift time
* Better fuel economy than the planetary geared automatic transmission and manual transmission
* When the car is going downhill the clutch disengages, allowing the car to coast

Disadvantages

* Response time from letting off the throttle and then reapplying is lengthy, around 400ms, depending on the situation
* Can be expensive to manufacture, this discourages many automakers
* They are heavy: 75kg vs. 47.5 for comparable Getrag DSG and Manual models
* Being complex mechanisms there is more to potentially break