The four cylinder Z3's may not have the oomph of the later six cylinder models, but it is fast enough to get one a speeding ticket! On the other hand, I believe the handling is lighter and better balanced without the extra weight of the six cylinder in the front. The four cylinder wants premium gas, but gas mileage is great! And, yes, people do stop and ask about the car or look as we drive by. The BMW dealers are expensive for service and/or repairs. But dropping the top on a sunny day and cruising the back roads makes it worth while!
Light handling, great fuel economy, just a lot of fun!