Cheers for that.
So the car would need to be data logged with VAGCOM.
Out of curiosity, what settings are the norm on the revo? Is it 9,8,8 or something?
If conservative settings are used then no. If you want to get the most out of it yes. They'll ask what octane fuel you're using and how you drive the car to help determine the settings.
For my car, good basic settings without data logging would have been 9,5,5. The Revo dealer set it to 0,8,7

IMO the Revo is not jerky at all. Yes, there is a surge of power when the turbo kicks, is this what some are saying as on/off?? Also power delivery can be altered to a certain degree by the settings.
For me, I was bored after a week and desperatly wanted more power which is why I'd like an ed30, but give that a month and i'd still want more..
Try them both before you buy...