DBW is a well accepted and reliable upgrade for our cars, and it's the only one that is proved. On my car, the more throttle i give, the more fun and aggressive the changes are. Of course it is not cheap.
Reflashing the software from another car, is something i wouldn't do to my 100k car. Some people that have flashed the cs 360 software ended up with geabox or f1 pump trouble sometime, asking themselves 'why did this happen to me, f^^ing italian cars'.
If you really need some more agressivness than standard, you should search for the 1st generation 4200 ecu, that had real hard changes. It's the whole ecu, not only the software. Second step is, no matter what the software is, set the pis point low. This will give you aggressiveness without paying a fortune.
On the other hand, people with unknown 360 software, will just feel the difference because they just got rid of some hundreds of pounds to reflash, just like a placebo effect.
Hope this helps.