the last two Astras it may struggle to outperform
not sure on their power outputs mind so can't really comment
its not a bad lump but its more GT than GTI 
how did it feel on the test drive?
felt smooth on the test drive, but did not really put me foot down, as had not brought it at the time, will be more willing tonight,
the Astra 1.6 is 115bhp and i think this would out perform it as its very sluggish.
I think the twintop would out perform the VW when the sports button was pressed. as that did give it some ommph, but it was a heavy car! so we will see,
D