I would agree with some of what Pauly said. Yes the reverse is a little slow to catch up, but mine only lags if I have my foot on the brake and try to hold the revs up to get a flying start off the line etc, but i've managed to work around this now and used to it. I do have mine booked in for a re-map, including the DSG, but that's not because anything is wrong with the box, it's just because I feel the gear change points need to be moved around slightly to get the most out of the 204 power, which they can do within the software apparently.
I also have a MK7 Golf diesel, and that's also DSG, but that is a little more responsive on the throttle, the downfall is it's only the 6 speed DSG, where as the T6 is 7 speed.
It's a no brainer for me personally. Easier to drive, more relaxing than my manual, smoother, faster, and most importantly, you can eat a bag of crisps and steer with your knees if you want to. (Not that i'd advise it of course)
I guess you'd be better if you could drive both, if you haven't already, and if you pass Leicester, and you're insured, I'd let you try mine (204 DSG) just to give you an idea how the DSG performs in the real world, with the same power as you're looking at.