 Purchased in Sept 2006. Third Audi I've bought in past 4 years.  A6 2.7T and A6 4.2 and now this A8L. I still have the A6 4.2, which is 4 yrs old and in top shape with 54000 miles on it.  No problems.  The new A8 is rock solid, and just as peppy as the A6.  Interior is absolutely top quality.  MMI is a bit daunting for me, but I am working through it.  (Never had one before.) I think the side mirrors could be a bit larger, but I love everything else, including the massage seats and front and back "radar" for parking.  I will buy another in 3 or 4 years.