Opps! After going to the link for CursorFX I see it is a replacement for CursorXP. I still will not pay more since I had this for years.
This is totally respectable. However CursorFX is newer compared to CursorXP the same way Windows Vista is newer than Windows XP: you get a new user interface and new features.
New features are such things like dynamic shadows, motion smoothing (Plus), animated UI, etc.
There is also a new theme format that has new options such as integrating effects into themes (you will see this more and more used) and several new scripting and animation options in Beta 2 that will let cursors be more and more cool.
I agree the editor needs much more work and documentation, however it is not needed today to let you enjoy old .CurXPTheme files.