Having previously owned a G-35X, the M-56X is a beast. It doesn't have the handling characteristics of the G-35, which were fantastic, but the M is a bigger car. The 420 ponies under the hood are just awesome.
We have had this car for 3 years and have taken it in for MULTIPLE MULTIPLE repairs. Once we found out they don't even make the part anymore and had to have the part actually made in Japan and sent to US. Took weeks to get the car repaired. None of the repairs have taken a short period of time. Now a piece broke off and shards of metal went in the engine and they say we need a new engine. After so many times of having to fix this car, the Infinity rep was asked to pay for the new engine and they said no. Why make a part that if it breaks would shatter and go into the engine and cause you to have to have a new engine???? They said they would put the car back together (with the shards in the engine) and if it broke down again they would give us an employee discount on a new vehicle. If it breaks down because of the shards in the engine the engine could just stop, would you want that to happen if you or your child were driving the car? A 2011 model and they discontinued making certain parts for it? They put in parts that if they break cause engine damage!!! Think before you buy.
I have been driving BMW 550i since 2006 (first release of 550i). I cant deny I had a lot of fun and appreciation toward my Beemer. But I did not notice any subtaintial improvement from the model 2006 to 2008, even the HP remained the same between 2006-2008, this year they did man up to 400 HP...but the price also jump to almost 1.5 times. So I took a look at Audi, Lexus, Acura and eventually ended showing up in infiniti showroom. I was not really thrilled about exterior but the performance of the car is outstanding. The comfort seating, smooth driving and the 420 hp did blow me away. The navigation system, rear view camera, and the gear mode changing are excellent...
Had an E550 that i liked a lot-but it was not very sporty. The interior is much nicer than the e550. the performance is about the same. i love the change but have nothing bad to say about the E550. Also like the larger feel of the infinity.I think the E550 is more expensive when you consider option for option.
I'm happy with just about everything on and in the car except the transmission is jerky and undecided as to what gear it should be in at slow speeds. Between 20 - 40 mph, the gears shift up and down over 1K rpm because the computer can't figure out what gear to be in. The car actually jerks back and forth. Infiniti knows about this and is working on it.
nice sound system, maybe a few more features needed in the storing and playing of CD's
Keyless entry, you need to physically push the door handle button, the 'Blind Spot System' has blind spot and lane changing on the same button that can't be reached while you're diving - they should be in the Set Up on the screen.