Hi mate - I've got a 14 Plate 1.2 TSI FR - had an Avon stage 1 re-map done at a local (to me) specialist. No problems at all - indeed, the car felt much more alive. Pulled better throughout the rev range - economy has stayed the same - win/win! Don't know where you are in the country, but if you're in the North West, search for ADS Preston and ask for Dave Massey.
Cheers
Simon