I am having good luck with my combo so far. It is just put together, there really hasn't been any tuning done to it like a custom chip or anything. As far as drivability it is really smooth and has good street manners. I know a couple of people with superchargers that have had all kinds of tuning problems. Supercharging a car is not as easy as you make it sound. But I think my car is running well, that is only the 4th time I have taken it to the track and every time it just keeps getting quicker. All and all building a fast natually aspirated car is not all that hard, just do your homework and pick a well balanced combo.
-Chris