Fully satisfied means that it performs as expected. I am afraid I have no very scientific approach: I did no pre-installing dyno and have yet to perform a post-installing dyno.
Fuel economy is of no interest to me as the roadster is a 100% hobby car, which is only driven for anywhere between 1500 and 10k kilometres each year. However, I dare to say that if you manage to restrict yourselves by using your throttle as before, there is not much of an increase in fuel consumption post-installing. "Unfortunately" I do not manage to restrict myself. Instead after a proper warming up of the engine I tend to start playing with it and that obviously does affect fuel consumption.
Mine does not ping when hot. As per one of my above comments, i feel like Mad Max when driving around with it however, because it sucks in air quite noticeably, not to say aggressively.
As for day-to day driveability: it slightly increases chances of the rear braking out. For example when being a bit to enthusiastic on the throttle on one of those miniature roundabouts for which the Netherlands are (in)famous. However, to me that only adds to the fun and it is also something which you get used to very quickly. Thus: I would say that after a few moments to get to know the effect of the supercharger under various conditions, the day-to-day driveability is not affected at all. You will be very well able to dose its effect and to control the extra power kicking in or not.