There are known flaws with any vehicle on the market.
The 1st gen G35 is known for the AC/Radio control going out, which is not all that big of a deal to have to fix if you know what your doing.
With that being said, I bought my 2003 G35 sedan in mid 2012 with 154,000 miles on it.
Very high milage for a used car, so I expected to have some problems.
The first thing I did was change every drop of fluid in the car, spark plugs, brake pads, wiper blades, ect.
to ensure everything would be in good working order, and the car hasnt let me down yet.
A respectable 260 HP gets you up and moving to your cruising speed.
It has an extremely comfortable cabin with plenty of room for all.
I just bought my car used about 2 weeks ago. It had 44k miles on it and it was originally a lease car from 04/02. I already love this car! When searching for cars, I gave my wife a list of features I was looking for in a used car. I actually went to the car lot to purchase a Lexus GS300 I saw on their website. But on my way to look at it, I stopped to look at the G35 sitting next to it. I really loved the sports sedan look and feel of the car. And once I drove it, I was sold. From the one touch up & down features of each window to the auto to manual stick, this car easily fulfilled my wish list! My only complaint was that the car needed brake service and the dealer took $500 off. Cost $700
We bought the 03 g35 for 23,000 fully loaded with navigation system, tinted windows. The car is the nicest and fastest four door i have ever driven. My wife loves it. I bought it because we needed a four door and my wife is young and she still wanted a car with speed and comfort with safety for my son.
Had this car going on 5 years and 100k miles. I have replaced the brakes and tires more often than a normal car but based on performance and how I drive, it is understood. The engine and transmission are bulletproof. A blast to drive. Better performance dollar for dollar than a BMW (owned an X5 and 330i) but you do sacrifice refinement and fit and finish.
We have had 3 infinitis and have been very happy until this G35. The circuit board controlling the AC, heater Stereo, CD etc.will not work. It has been stuck with no stereo CD and AC has been at 64 degrees for the Last 8 months. We have been told it will cost $1500-$2000 to fix it if we are lucky. This seems so outrageous to us. We feel infinite has let us down totally. This should be a recall as the mechanic said many cars of this model have come in for the same problem. We are VERY disappointed in infiniti and would never buy another if this is the way they stand behind their clients. So sorry.