As someone who has owned many BMW's I was curious as to how this stacked up vs. my 428I. I thoroughly enjoyed the car and wish I had purchased it vs. the 428!It rides and handles better and is a much more fun car vs. the 428.
After every drive I tell my wife, "I really enjoy that car". It is a roadster, not a luxury sedan. It's firm, but compliant for a roadster, even in sports and sports+ modes it's not terribly rough... for a true roadster. Having said that, it's very *easy* to drive, but when you get on it, damn, it becomes an entirely different beast. I love the hard top - both the functionality and styling are incredible. With the top down, let even more good times roll! I highly recommend the sdrive 35i as the torque, overall performance, and the wheel-tire combo is much more suitable for this type of car.
Be prepared for people to have opinions about this car! Some neighborhood wives will disapprove silently, some neighbors will love it. But I have also been stopped to ask "How do you like it? I've thought about getting one too!" It will turn heads. But, regardless, I love the feeling I get driving this car!
Great roadster with just about the perfect balance between performance and comfort. People often complain the weight of the hard top and it's not as engaging as the Porsche Boxster/Cayman; but hey, the Boxster is a few grand more expensive even with the base form and the s can easily be $20k+ more pricey. If you don't track, the z4 with the N54 engine will be more than enough performance for your daily use. Also, the hard top gives you a sense of security versus any of the soft cloth top, plus looks way better when top is up. Since the new z4 will come only with a soft top, I will just keep mine until the wheels fall off. There's really not many choices if you want a modern hard top roadster (all come to my mind are z4, slk/slc, sl, Ferrari California, mx-5). I think the z4 has a sweet spot in the segment in terms of comfort, performance, style, price and will hold its value pretty good in the future.