I've been driving my car for the first time in ages today. It's just had the GT4088 (0.96A/R) fitted since the PHR1 failed months ago.
First impressions of the 4088 are very favourable. I like that it comes on boost a bit later than the GT60, which means that I'm not on boost every time I touch the throttle when cruising on the motorway. Hopefully this will make the MPG a little easier to bear.
When it starts boosting it's quite linear at first but really takes off at about 4000rpm. I haven't had a good play yet and don't really know what it tops out at revs wise but I'm sure it's going to be a lot better than the asthmatic GT60, which was all done by 6krpm.
Also, I dunno what's up with my SBCiD boost controller but with it set to 1.0bar the car is hitting 1.2 bar. Air leak on the EBC wastegate hose maybe?
Anyway, very pleased so far.