I have been using Spry for several years now and recently upgraded to the new Plesk 8.3....I had a few things to learn, but the team got me through it just fine. And I have to say that the new 8.3 solved many of the headaches I (and my clients) were experiencing with spam. Our spam has dropped to a trickle and my clients are delighted. Not to mention the backups, security checks and other enhancments available through 8.3 are outstanding.
Thanks for putting up with me Spry!