I owned my 09FX35 for a few years and now have owned my FX50s for over a year and I find it as smooth or smoother than my FX35 was. I love it and would purchase another. I don't understand what you mean by a choppy V8 engine.
I've also owned an FX35, as a matter of fact before my 50, I owned a 2006 35 and an 2008 35 and no way is the 50 smoother than those two. I'm not talking power just plain smoothness when the car is accelerating and decelerating. The 50 is definitely a little choppy in fast acceleration and deceleration. I don't know if you drive hard or not but if you don't you'd probably never notice. I've even had an instance where I was braking super hard and the engine raced a little while the rpms were dropping. I know I'm not the only one who has experienced these issues they are the same issues everyone was experiencing before the transmission updates. The last update Infiniti had was for the FX35 and did not include the 50 but the 50 still has noticeable shifting issues.
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