All leather will do this, but Infiniti leather will do it sooner than most other cars. My driver's seat has a couple of tiny cracks in the vinyl side; that's the area that most people complain about. I fixed them with a kit since they were so small and not through the material. We'll see how it holds up. My drivers side cushion also has the typical wrinkles everyone has. I used Leatherique conditioner on it and that's made it better, but they're still there. I bought mine with only 12K miles and the seat cushion was already showing the wrinkles; to me, that's not quality.
As comparison, previous car was an IS350. Bought new, owned it for 3.5 years and the leather looked brand new, no wrinkles, no cracks, nothing. And on top of that, it was softer than the FX's. Friend's 04 BMW, leather looks brand new to this day. His wife's Benz, it's an '06 and again, leather looks great. Even on my wife's old Integra; it came with cloth seats so we installed Katzkin replacement leather covers. Used those for 5 years and 40K, when we sold the car, they looked as new as the day we installed. I also had a Protege5 that I bought w/ Katzkin leather, I abused that interior for 70K, and it held up better than the FX. And I think those are like $700 kits. Overall, I think Infiniti cuts more corners than the other luxury brands. You can definitely see it in the leather as well as in the fit/finish of the rest of the interior with rattles and such. It's probably a leftover from when Renault took control of Nissan in the late 90's and slashed costs. I owned a 4th gen Maxima when they replaced the independent rear suspension with a beam to save money.
Overall, I love the FX, but the little things are irritating.
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