On the rollers this morning the GTEC2 gave about 7bhp more than the GTEC1, plus a little extra torque, so not a great difference . I'm going to be sticking with my GTEC1, which feels little different on the road, and does allow for not being able to find super unleaded on occasion .
Iain - I'm getting a unichip in feb and will be taking both Gtec1 and 2 to see which they prefer to map over. I'm sure that you can run 95RON fuel with the unichip as it's a bespoke map. Believe the Gtec is used as a starting point.