Quite smooth, but obviously the accelaration with the DSG i prefer as i find you can mash the throttle and the car can get the power down without wheel bounce or hop if your over zelous with the clutch/accelarator in the manual.
Personally think the GTD with DSG would be a great allrounder if im honest, thats quick, effecient, and easy to drive/live with.
At a recent RR day, i had a fellow Gti Pirelli thats a Manual gearbox , at the same state of tune/same 300bhp, tried following over the B roads and couldnt keep up without very bad traction.