I think the paid ones are mostly useful if you're trying to seem legit / not get caught, as they focus more on improving your awareness during the game. If you're just pubstomping on throwaway accounts you can have fun with the free scripts without the paid ones, although if you know what you're doing you can of course just use both.
I think the paid ones vary by what they cost but they seem to be one time fees, last one I saw was $15
