Could be a nice app, but......... – Invoice Maker PRO: Flex Simple Review

This app takes some patience! Once you figure it out, it does make a nice invoice. But, after using it only a few times...it's telling me I have to upgrade to "premium" for $7.99. It won't let me use it if I don't upgrade.
Review by &/@&:;!€£$& on Invoice Maker PRO: Flex Simple.