What you're getting are "lite" versions of these products. The only one I've tried is Ozone Elements, and I felt it was too limited to be of much use. You basically get presets and little else. And presets aren't really much help in mastering.
That said, if you're thinking in terms of a cheap product to introduce your students to some concepts, it might serve that purpose just fine. But if it's for your own use, you'll be better off using Cakewalk's new limiter.