Yeah for the fuel savings I would have really liked it to be present. I was surprised and a bit disappointed that it wasn't there as well. Probably the one feature specifically that I would take if there was one more to add to the car. Even over LSD, 360 Camera or a few of the other things the Prestige and 3.3 Sport receive. I did test drive the 2.0T Elite and C300 with the stop and go and found the G70 implementation to be smoother. Both were pretty unobtrusive though, you'd get used to them fairly quickly and if you're in really hellish stop and go traffic you can just shut it off.I’ve had it in 2 cars (still have it in 1) and if the implementation is good (ie if it is seamless with smooth shut downs and re-starts, if the hardware upgrades like battery and starter are properly done etc), I think it’s a good feature and I have gotten used to sitting at stop lights in silence and peace (except for my music of course). Once I got used to how it works, I find it relaxing and appreciate every minute of lower emissions. I’m less concerned about my gas mileage - except maybe with this thirsty G70 .
On a side lighter note it also leaves 2 blank buttons in the centre console for the camera and the stop/start switch and those blanks make me sad. ;-)