We have always been patient to new versions/prudocts of any brand as well as Plesk, because although we know they're tested many times they may have serious bugs on real applications.

So after waiting for the aqua to be smooth for a while, we started tests 6.5.2 > 7 from backups to clean installs.
But when I investigated the forums deeply, I realized that strange issues are happening on pruduction servers..

So I wanted to ask to the guys that have completed their upgrades

Are you comfortable?
Would you advice upgrading or waiting with 6.5.2?
Maybe a list of issues plesk related/non-related