Really simple to install and only took about 15 minutes.
The car is significantly faster since although I haven't managed to check the top end yet. Used to take about 8 seconds 0-60 and is now just 7 seconds. There is also a much louder 'whistle' from the turbo when pushing it, which was not there before and when you ease off the gas, you can hear the turbo pressure being dumped, which was a bit disconcerting until I got used to it. The only downside is the torque-steer at full throttle and the occasional accidental wheel spin (even with the ESP on).
Fast driving is now more exciting now as it demands more concentration and I'm looking forward to having another go at the Astra turbo which passed me doing 150 a few months ago!!
[4 of 5 Stars!] 
