Yeah, I had the pe's last year, and this year I have the AR6's.  I found the AR6's to be much lighter, buttery, and generally more fun to ski.  The only thing I found to be less than perfect with them was that the topsheet chipped a lot, but I guess that probably happens with any sandwich construction ski.  Go for the AR6's, you'll like them a lot more.  And they will be cheaper than the Extremes if you buy last years model.