Just to add my experience on this. Had my Ed30 from new and after about three and a half years decided to try a remap.
After much looking and reading on this forum I went for the Revo Stage 1 map in December. It really is the "should've done that ages ago mod".
I went for Revo as I imagined the numbers of maps they have done for 2.0 VAG turbo cars means their product should do what it's supposed to do, for me it is fab, however i'll concede that there are the odd exception where it doesn't work right, that's only from reading of heavyd's problems on here.
I went to Revo also as Stg2/Stg2+ was on my radar and the upgrade path is cheaper for further maps.
I wanted a totally stock 'feeling' car when sat in traffic etc, didn't want some highly strung prima donna. In short I wanted a VW Golf still.
The remap in conjunction with a high flow fuel pump has been really great, no issues, no real difference in fuel used, but I don't tend to analyse economy much anyway. Had a Dbilas intake and Milltek DP/Cat fitted yesterday and that just adds to the enjoyment, now making it slightly more 'fruity' sounding.
I think my objectives have scaled back - the car is and always will be a daily driver - so think I will get a Twintercooler sometime and just stick at the middle ground of perhaps Stg2, but running cool.
I never felt even standard it had lag, but guess it depends what you're used to, my other half's GT TDi 170 now that's got lag. She then drives the Ed30 the same way and we fly up the road. Since stage one the car is much livelier. Great mod for the car.