I bought my 2006 G35 Coupe automatic in 10/2006. I have had one accident, some small fender benders. Overall the performance has been great.
The good: The car handles well, superb acceleration and braking. The automatic transmission has been reliable, although a little bumpy between 1st and 2nd. The styling of course is unparalleled. The interior technology package has worked well - the navigation is spot-on - a little awkward to use with the joystick inputs, but not bad for 2006. The Bluetooth has never failed though 4 iPhones. It connects every time, and the voice input is about 95% accurate. The audio system - CD changer, speakers work perfectly to this day. Electronic seat warmer and adjusters have not failed.
The bad: Interior components have been cheap. There have been a few gimpy components. The removable cupholder - very cheap and the spring broke after about 2 years. The DC socket has failed about 3-4 times. Driver window motor had to be replaced after 125k miles. The tire pressure sensor had to be replaced after 90k miles. After 80k miles, leather covering the door panels are starting to peel off, and after 120k miles, the leather on the side panels in the back have completely peeled off (and nobody ever sits back there).
The ugly: Tires - need to be replaced every 20-30k.
Overall I like this car. Performance is very reliable. I have not had many huge problems with the vehicle, however there are numerous small fixes for the car. The car is very tough on the tires (and I have a stock 18" wheels).
I have had this car 7 months and it has been a great car.
It is very comfortable and can boost a persons driving confidence with its stability program.
It has a lot of great things like its amazing looks and comfortable seating.
warning the trunk is EXTREMLY small in the coupe (one suit bag and a couple of small bags.
It has a large gas tank in that my average fill is usually 57 to 64 liters.
My favorite features would be the comfortable seats (use mothers leather tech to clean and condition).
as well as the car sleek and clean lines that is almost timeless.
At high speeds remains comfortable and at 120mph still feels solid and doesn't become light.(not many can say that)
Also the key less entry for the trunk and the doors is a lot of fun (just leave the key in your pocket and push the button on the door handle or on the left taillight and get access.
The cons would be the tire sensors that wont auto learn and force you to feel raped at the dealer $85 to relearn.
The mileage is alright but nothing spectacular in that at 70mph I averaged 21mpg when car was stock but 23mpg now that I have put a colder sparkplugs in and a stainless intake and a cold air intake.
The car is great but don't compare against new vehicles because 5.0 ford pickup will kick your butt in a race.
also the car feels like it twists at your seat in twisty corners (larger sway bars and strut brace will cure that).
Also get a baffled oil catch can installed as it will save the motor and make the car more durable.
I sold my E36 M3 and bought a 2006 G35 Sport Coupe.
It had 22K miles on it.
It's got great power, handles great and great brakes.
It gets lots of looks and sounds awesome.
It ain't no BMW.
The interior is kinda cheesy, the clutch is horrible and the seat belts don't retract.
Don't get me wrong, I love it but I'm just not passionate about it.
The reason I picked it over an E46 M3 was the reliability.
Having the check engine light come on every other week on the M3 was a little frustrating.
Did I mention how great it sounds?
Especially with the sun roof open and the windows down.