zhon 
2009 Nissan Altima Sedan 2.5 S 4dr Sedan (2.5L 4cyl CVT)
2009 2.5 S
 I bought this car new in October 09 and have only positive things to say about it.Great power and acceleration for a 4cyl.Some reviewers have stated problems with a delay on acceleration.I have not experienced this, my car accelerates immediately and quickly.I barely have to touch the gas.Much more responsive than any other 4cyl I have driven, and I have driven many.The engine did sound like a diesel when it was below freezing, but that seems to have gone away after the first 6000 miles or so.It is no louder than any other 4cyl.One suggestion for those concerned about problems with the CVT: read the owners manual for proper break in procedures on a new transmission. 