The FX moves faster than a two-tonne car has any right to, thanks to two powerful petrol engines. The FX37 uses a 316bhp version of the 3.7 V6 from the Nissan 370Z, so it’s no surprise that it’s impressively brisk. The FX50 has a 385bhp 5.0 V8, and performance is even more electrifying. Both are driven through a seven-speed automatic gearbox.

The FX may not match the agility of a BMW X6 in the corners, but there’s fun to be had due to decent body control and quick steering. It could be a little grippier, but the ride is a bigger issue – you feel too much of the surface at all speeds, and bigger bumps can give your backside a jolt.

The engines are quiet when you’re pootling along, and sound pleasantly meaty when you extend them. Wind noise isn’t an issue, but with the massive tyres underneath you, you hear a lot of road noise - and even more if you go for one of the versions on 21-inch wheels. There's some clatter from the suspension, too.

Whichever FX you buy, it won’t be cheap. Residual values aren’t great for the class, either, so you’ll find yourself more out of pocket than BMW and Land Rover buyers at trade-in time. You’ll also pay a king’s ransom to run it because only big petrol engines are available; and, with CO2 emissions as high as they are, don’t even think about it as a company car.

Most of the materials you come into contact with every day are reasonably plush. Not up to prestige German standards, but nice enough. However, some of the more tucked-away panels feel way too cheap for a premium car. Although Infiniti is an unknown entity in the UK, its close link with Nissan should give you peace of mind over reliability.

Standard stability control should help keep you out of trouble, but if trouble becomes unavoidable, there are plenty of measures to help prevent injuries. Front, side and curtain airbags are provided across the range, as are active front head restraints, which move in a rear-end collision to minimise whiplash injuries.

The seats adjust electrically in all versions, and there’s two-way adjustment for the steering wheel, so you won’t have problems getting comfy. A small rear screen means rear visibility could be better, though, and the multimedia system isn’t the most instinctive one we’ve come across.

A huge car equals a huge cabin, right? Wrong. The FX is surprisingly tight for both front and rear passengers, meaning adults won’t be able to spread themselves out. The boot isn’t as big as you expect, either, but the rear seats do fold to extend the load area when necessary.

Think of an item of kit that a car might have, and chances are the FX has it as standard. The entry-level GT comes with electric leather seats that are both heated and ventilated, privacy glass, self-repairing paint, electric sunroof, an all-singing multimedia system and 20-inch alloys. The S adds adaptive damping and 21-inch wheels, while the FX50S adds rear active steer, intelligent cruise control and an upgraded multimedia system.