I have a Kerma tune on my 2013 Golf, but no DSG tune. Prior to the tune I couldn't really see an advantage to a DSG tune. Now I do. VW changed the DSG shifting some, as compared to my 2013 Jetta TDi-DSG that I turned in in 2016. Wish I'd kept it. The Golf has more road noise, but the Continental tires may be partly to blame. Anyway, the car launches hard in 1st a bit harder than the stock tune, and in 2nd gear the engine no longer lays down & reduces power, so 2nd is damned near as violent as 1st! Its almost like the damned thing is going to tear itself apart! I get tire spin in the first two gears, and even 3rd if the road surfaces are right. It is quite fast, even compared to a pre diesel-gate TDi. Passing on 60mph+ two lane roads aren't nearly as iffy as before the tune. The tune is supposed to add 34hp and 95fp torque. It feels like I'm getting most, if not all, of those numbers. My seat-of-the-pants dyno says it's got more!
I bought the tune for better fuel economy, if I could keep my right foot off the firewall I would be getting better mileage. I'm seeing 6-8mpg better on the instant fuel economy numbers on straight and level roads at 60-65mph. After the fun wears off I expect I'll get better mpg, and hoping it's in the low-mid 40's. Current best 1 tank is 39mpg, and over the 7 months I've owned it it's averaging 37.1, not real good IMO. My Jetta got 40.1mpg over 3+ years of driving over 25k miles. Driving habits are virtually the same with the Golf, which is lighter and was originally listed as getting (IIRC) 42mpg combined miles. So now the Golf TDi gets worse miles with the fix. VW really screwed us on the MPG's on these TDi's with their 'fix'. I think this tune is going to put me back in the 40's range. We shall see.