Provided you're in the front seats, the FX35 and FX50 cabins are cozy places for a long haul. The interior is in many ways comparable to that of a sports car or sport sedan, and while it gives front occupants plenty of comfort and enveloping support, it shorts those in the back seat. Cargo space suffers, too, because of that stylish roofline.
In front, the seats are about perfect—nicely padded and somewhat bolstered for curvy roads, also heated and cooled in most models; most will find them great for a long day of driving.
Backseats also are tough to get into with the arch of the roofline in the way, but once you're in, there's just enough space for two adults—though surprisingly little legroom. And for those who plan to carry much cargo behind the backseats—or even the front ones—the FX still isn't a great choice. The back window is limiting, and the load floor is high.
Materials are like those used in luxury sedans, not SUVs, and there are plenty of delicate details, like the soft leather, with criss-cross stitching, for the sport seats.
Ride quality varies depending on which model you choose. In the FX35, it's firm without being at all jarring; but FX models tend to be firmer, to the point that it might be uncomfortable over frost heaves and potholes. Thankfully, unlike Infiniti's G and M sport sedans, the FX's interior doesn't become much noisier on coarse road surfaces.