Plesk 8.2 that is coming out this month is not a BETA, it's the real thing. However, if I was you, I would wait about a month to see what problems crop up. I've learned the hard way with Plesk it's often better to not be the 1st mover. People pick up problems quite quickly and Plesk is quite good at fixing them, but do you really want the pain of discovering the bugs yourself.