There is a difference between the "Update" for about 250$ and the "Sidegrade" for people who have PP and P8. for about $70. I did not check the prices yet, so I they may not be exactly true but it should be close.  P8 alone is good for an update, but not for a sidegrade, IMHO

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.