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The business model they use is very interesting in picking price points. The subscription monthly is so bad if you're picking that is almost certainly a bad deal. I don’t recall the background of this being created, but I could swear it had students in mind. I would image than someone taking a writing class would be willing to pay on a month to month when needed.

Definitely. Worth trying and then going for 12 months I reckon - if it's of use to you.