Before yet investing in another, I would have expected some more serious development for version 18, incl. bug fixes!
For my experience, the new GUI renderer introduced in v.18 caused lots of new issues (such as windows/dialogues not receiving proper focus) that would need to be fixed, and some lost features (e.g. scrolling player bar title text) that should first be restored to make v.18 worth its price!
I think it's a little bold to make us pay again before these current version issues are resolved; remember we're NOT talking about new features, but pending fixes. Can we be sure these issues are at least being addressed in the new version?