You'd expect pretty much any sports car or roadster to sacrifice some space in the name of driving fun, and here you'll see signs of that familiar tradeoff.
The seats are comfortable and highly adjustable, but sit high enough in the cabin that taller drivers will find the low windshield header problematic. With the top up, headroom can be tight as well, though only for those well over six feet in height.
Any travel in the Z4—heck, even a weekend trip—will involve coming to terms with limited cabin and trunk space. There's only space for a couple of small carry-ons and a few personal items, really, although there are plenty of places for smaller items, in trays and pockets, and accessory packages can make it better.
High-end trim materials and smooth, soft leather upholstery make the Z4's cabin both modern and comfortable, while giving a touch of a nod to the classic roadsters. There's an extended leather option that covers the dash, door caps and visors; and generally excellent panel fit. Squeaks, rattles, and vibration—a frequent issue in open-top cars—are minimal, and BMW even takes an extra step or two with features like Sun Reflective Technology in the leather seats, which keeps them from reaching scorching-hot temperatures even when exposed to direct summer sun.
The BMW Z4's power retractable hardtop is one of its strengths—not just because its mechanism operates smoothly, quickly, and without fuss but because it serves to better isolate the cabin from road and wind noise—and make all-weather use a possibility.