Depending on the condition of the 500E, go for it. As you have read, the production process and resultant quality put into the build makes this car in a different class. Also, given that many of the parts are found on other MB lines, costs to maintain will not be out of line with other MB models. Biggest indicator to you - drive the beast! You will see why we love our 500Es. I think Roas did a trade up from a 400 to 500 - so he has the best experience with this decision.