Still on 7 here.  Let's see I could spend out $99 to go to P8 and $199 to update Vue and have two products that don't communicate properly or stay where I am.  Don't have the $$$ anyways.
I want to wait until the major bug shakedown is done on P8 before getting into it.  From what I've seen they've gone through 2 service releases in about as many months so there are still problems.