Im happy with an increase of 50bhp... which i think is realistic based on the gains from revo. RR are a lottery as we know, but as long as conditions are kept constant its just the gain you want to know. So 260-265 would be spot on.
I'll bet all the remaps give 40-50 genuine peak BHP and between 80 and 100 lb-ft of peak torque regardless of the marketing bull.
Once you remove the "Oh, we must have started with a good GTI - it made 235+ BHP out of the box" fantasy stuff, you are left with a good honest gain of around 40-50 BHP and 80-100 lb-ft, with varying delivery characteristics depending on the mapper.
Which sounds pretty good to me!