Hello,
I'm sorry for all those issues!

Loosing dials should be pretty hard, there is a lot of recovery options:
https://github.com/fastaddons/GroupSpeedDial/wiki/Recovery-of-your-dials,-how-are-dials-stored-and-how-to-make-a-backup

Regarding the Pro features, there is only handful of those:
https://github.com/fastaddons/GroupSpeedDial/wiki/PRO-version-features

Most features is free.
The main problem is that many of the features can be hard to discover, for example right click on the group name / Edit group can give you access to resizing or changing group layout (when it's full).

Best regards,
Juraj Mäsiar