After a week of commuting, here are my thoughts on the Remus backbox delete...
Cold start - a lovely sound that puts a smile on my face - no complaints from the neighbours or my wife. Looks great.
A roads to motorway - really like it. Not too loud but lets you know it's there.
Motorway - fine up until 3,000rpm but drone above that which gets a bit tiring. Sounds like it needs another gear - maybe they should do a 7 speed DSG ;-) Music is turned up to compensate.
Country roads - bit of extra noise nicely replacing the Soundaktor, which is now turned off. Upshifts with the paddles or in sport DSG mode gives really loud farts. Nice noise on downshifts, particularly when coming to a stop. Happy to drive without music so I can listen to the car.
A few comments at work saying how much better it sounds (although unfortunately one did say "more boy-racer").
Overall, I'm glad I've made the change for the cold starts and country roads but I could see me changing back (and maybe doing the res-delete like jaceyboy) if my commute changed to be more motorway based, as the drone above 3,000rpm is there as feared.