The 3.5 SE with CVT is a very sporty front-wheel drive sedan.  It is excellent in long drives and gets decent gas mileage (up to 31mpg on highway).  One downside is that if you want to push it hard, it likes premium gas.  If you don't drive it hard, then 87 works fine.  
My biggest complaint is about the stock tires.  They are not as good as I hoped in snow/rain.  Also, they are not very good performance tires.  I plan to replace them once they're worn and get something better.  09 Altima's come with different stock tires, which would address this.  
The car has an amazing chassis.  It loves twisty roads and highways.  I would say it is by far the best front-wheel drive car that I've ever driven.
The CVT is amazingly smooth and provides instant power whenever you need it.  However no-transmission can read your mind.  Fortunately, it can be shifted manually as well.  The response is instant.  
This is a car for the person who does a lot of driving and likes to enjoy themself behind the wheel.  It is much easier to live with than its sportier competitors and makes for a great every-day driver.    

I make excusses to go out and drive this car. I have gotten positive comments from buddies of mine that are into racing and fast cars.

i just have purchase a 3.5se m6 2007 the engine is good the travel of the shifter is too long the car understeer a lot on acceleration .....
id rather drive my honda prelude.....good space ....very comfortable
large thrunk...and good gaz millage for a 270hp engine

a little rough on city streets