After 12 years driving a Beetle, tried a Z4 on dealer lot. Loved it but could not see driving it in winter. Ordered a 128i which has same engine and manual transmission, just a few less hp, and all of the convenience features I liked on the Z4. Of course it was also a lot less money. It is just as much fun to drive, though not as pretty.
Absolutely solid and rattle free going over bumps. Really fun to wind up with the manual transmission. Quiet and good mpg on the highway, not much different mpg from the 1.8T Beetle but has much more hp. Like the voice control of iPhone dialing.
Sound system quality is not very good. The one in the Beetle was better and that car was a lot less. Floor mats should be included on such an expensive car.