 I bought this 2006 Maxima SL as a used car in 2009.  It was a lease turn-in with only 11,000 miles on it and bought it from a dealer for only $19,800.  After driving it for 2 months now, I'm really impressed with it and have nothing negative to say.  I have not seen or experienced some of the problems that other reviewers are reporting, so maybe they just got lemons.   I commute about 35 miles a day, both stop and go traffic and highways, and get a very satisfied 23.7 mpg.  The drive is smooth and the engine is powerful, not to mention quiet.  It's a fun car to drive!  I love the interior, with the leather seats and sky view roof.  This is my second Nissan and would buy again no problem.