I put off driving one for over a year as I knew as soon as I did I would want one.
I eventually went out and test drove the new Z4 middle of last year. Its a horrible thing to drive, there's zero feedback through the wheel and through your bum of what's occurring underneath you. The chassis has flex in it to and its just not a great feeling to drive.
I then went to Toyota and took two A90s out which are completely different, loads of feeling through the steering (which is impressive for a electronic rack) and they are so on the nose. You get lots of feedback and its a mega piece of kit thats a great feeling to drive. Only negative is you do feel a bit like you are wearing a baseball cap
Since Nov ive had a gunmetal A90 in the garage and I love it, proper mega car.