I owned a Z4 for 8 years. Great car. Solid. Never should have sold it. I did have to get the steering column replaced. There was a manufacturing defect which resulted in the steering "sticking" when the car was driven in extreme heat. BMW never admitted to the defect but it was eventually replaced under extended (non BMW) warranty. Quiet ride with the insulated soft top. Run flat tires a re a little pricey.