Is it true that there's absolutely no drone - even cruising on the motorway at or above 3,000rpm? I've seen videos online showing no drone but they're always bang on 70mph...
There is mild drone between 3500 and 4000 when you're hitting full boost but it would be very rare that I would stay in that rev range for a prolonged period of time. If I'm cruising then at most it would be at 3000rpm but in top gear I would be doing over 80 at that rpm.
For the sound increase at other times, especially the DSG farts, it's worth it. But I would say that if you have the money for a proper cat back like the Remus resonated system then go for that because it would sound much nicer but probably louder again.
I just went for the res delete because its the most bang for your buck. I was originally going to get a full system with remap but I've decided to save the money now and then go to town on my next car which will hopefully be a Mk8 R