Hey Neil-
Glad you dig the plug-ins! To address your points:
1) You don't lose the existing permanent licenses
2) It depends on what kind of contract you sign up for. When the free period runs out, you'll be charged based on if you signed up for a yearly or month-to-month contract. You can pause either one at any time, however. And, you can pause/end your subscription before the free period runs out, of course.
3) The free months is only applicable to when you first sign up (e.g. it doesn't happen every year).
If you'd like to just demo the plugins, all of them do have a free 1-month fully functional demo period.
-Tom
