I've got the DBW on my QPV Automatic. Haven't clue what it does really, and can't remember what it was like before. Just had an itch that needed scratching since there's so little you can really do to "upgrade" the performance of these cars in any way. Makes me feel better having a tiny switch underneath the steering column which I can flick one way or the other. Oh this and the X or Aaaaaaaitch pipe which makes the noise different.
Other than that you'll be contemplating spacers, changing your steering wheel, reading up on ECU tuning and coming to the conclusion that it's not really worth it for an additional 30HP if you're lucky, and then looking at carbon fibre parts and or dipping.
Then it will be what tyres, and what colour wheels. And that's about it. After you get all this out of your system you can relax and just enjoy the car, oh and obsess about cleaning and detailing product)
And then you'll decide you want something else completely and do the whole cycle again on a different forum