Yeah i thought aout revo but dont know too much about them, i also read that with giac and bluefin you dont effect the flash count, which i assume is the bit that would reveal to the dealer that it had been mapped 
Have you had experience of revo? I think i need to go in a few that have been mapped!!
A dealer will easily be able to see if your car is remapped if he takes the time to look at a few things on VAGCOM. If I remember correctly, bluefin does alter the flash count???? Someone please correct me if I'm wrong!
Being able to switch a map back to standard is a good thing to have. My dealer has told me that they would not look to see if the car was mapped, unless the had suspicion that it had been through driving. So if you switch it back to standard when it goes in for a service and they take it for a drive they will suspect nothing. (unless your car has a lot of other mods too)...
Revo is a very good product, and well proven with the 2.0TFSI engine. A lot of people on here have Revo, and there have been NO major problems at all from any member. Revo does not affect the flash count.
IMO, Revo is the only choice for a remapped GTI. Not to say that the GIAC is a bad map, indeed it was up there in my top considerations, however Revo had better customer service and support - so I went with them, plus the fact that I found a decent and friendly tuner that did Revo products.
I think that the relationship with your tuner is a big thing, and you need to also take that into consideration. There may be instances when an engine light comes on / simple issue that needs correcting, and having the full support of a decent tuner is paramount.
Also, the best piece of advice that I can give is go onto some tuners websites that have rolling roads, i.e. JKM Performance, Awesome GTI etc etc, and see the results of ED30's that have been on the rolling road. Normally, the modifications that that particular car has will be listed next to the graph. Take a look at the different maps with the different modifications and see what suits you best - be that torque figures, power figures, plot curves. Although every car reacts to a map differently, some similarities occur with maps, and you will be able to see this through the curves. E.G. (this is fictional)...if most bluefin maps had a large spike in torque early on in the rev range, but the GIAC map was more progressive with the torque. Then, you could see this pattern and decide which one best suited your driving style.
Let us know how you get on,
Chris.
