 Rent a 2007 z4 for holiday in Phoenix and drove it the Page via Grand Canyon. The acceleration is fantastic you can easily get to 80 or 100mph without noticing. But the steering was tight and sometimes I was struggling with it when it come to an uneven road. The circulation design was poor when the top down. I had it down on the way down Grand Canyon, the wind come into the cabin from the gap between the window and the trunk top. Wind noise is loud. Though it’s a beautiful looking roadster. 