We put more than 450 miles on our Z4, including one hard six-hour drive, and felt nary a sore bone thanks to the excellent seats. We did a lot of hard cornering too, and appreciated the pad against the tunnel for that body-contact spot on the outside of the leg below the right knee. We wish there were a similar pad for the left knee against the door, but there's a good dead pedal for support.The Z4 is a sports car, so there isn't much storage space. There's a decent-sized compartment between the seatbacks, which you can't safely access while you're driving because you need to either swivel in your seat or be double-jointed, but at least it's there. There are small door pockets, and also four tight nets for maps and papers, which require an option package to get. Coins and maybe a pen can be held in the scoop under the emergency brake handle, between the seats.
The aluminum spoke steering wheel is nice, an appropriate size for spirited cornering, and contains buttons for the sound system and optional cruise control. Our test 2.5i had leather with brushed aluminum trim in a darkish graphite shade and it looked clean. The matching silvery instrument needles are some of the most delicately shaped we've ever seen, teardrop stiletto splinters dancing up and down the faces of the speedometer and tachometer. The optional on-board computer provided information through a digital readout, your choice between temperature, fuel mileage or average speed since the last setting, or miles to empty. The latter is the only one that means much.