Despite the SLS AMG GT having about the same exterior dimensions as the C Class sedan (the SLS AMG GT is 76.3 inches wide, 183 inches long, with a 105.5-inch wheelbase), there's not much space inside. The sport-focused ride is harsher than most Mercedes vehicles, but even in the very hardcore SLS AMG Black Series, it's not beyond the borders of rationality.
Taller occupants will find headroom is a bit spare, though fortunately in the gullwinged coupes, there's a slight scoop out of the roof to accommodate those just over six feet. Roadsters don't have this problem as noticeably, even with the soft top in the raised position.
Entry and exit is also easier in the Roadster; the coupe's gullwing doors make for potential head hazards for taller occupants when getting out, and shorter folks may have a hard time reaching the door to close it once seated. After a few days of living with the car, however, most will adapt to its eccentricities.
These high-performance (and high aesthetic) compromises aside, amongst its supercar competition, the SLS AMG GT is actually on the more comfortable side. The seats are supportive but not overly firm, and adjust through a wide range of body types and sizes. Leg room isn't abundant, but only the most long-legged will truly be short of space. In the driver's seat, the steering wheel offers power-adjusted tilt and telescope functions, helping to achieve the ideal position, and the adjustable bolsters allow you to find the right balance of spirited-driving security or long-haul support.
There's not much storage space in the cabin, with just a small glove box and shallow console bin plus a netted pouch or two along the transmission tunnel. The trunk is small, too--about half the size of a typical compact sedan's trunk at 6 cubic feet. It will hold one set of golf clubs or a light weekend's worth of soft-sided bags.
Throughout the cabin, the levels of fit, finish, and materials are nearly flawless, as you'd expect at the SLS AMG GT's price point. The SLS AMG Black Series upgrades the look and feel of the chrome, leather, and carbon fiber to an even higher level. Noise, however, can be a bit high, with the wide tires and throaty exhaust making their presence known in the cabin even at moderate speeds.