I am totally impressed with the render improvements.  I posted a thread to that effect: http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2677264.  In that piece that I am working on I have a heard of cows (50) which take 14 min. to load into P7 (I timed it).  I was hoping P7 would handle it as EF promised in their advertisements because P6 froze like a teenager trying to add 2 + 2 without a calculator.  To my amazement, it rendered in about 4 min.  Just for that alone I am pleased with the new version.  I've noticed a couple of minor bugs, nothing to annoying which I am sure will be fixed in time.  But for now, I am happy with it.