I tried to set my fan curve (that is all I use it for) since it slammed it to 100% and that seemed to work after giving me a few errors at first; I'm guessing it wasn't compatible with the way it was set in the previous version and after setting it again it seemed fine. If you don't need the features it adds then i would stick to the older V5.2.1 since it has a lot cleaner and easier to use UI.