Has anyone tried Grammarly Premium and is it worth it?

For plagiarism i prefer this Plagiarism Checker site.Its sophisticated, intelligent paraphrase programme can propose answers for plagiarised content to prevent plagiarism.

If it's purely for proofreading and plagiarism, then it may be for you. To be honest, though, it's not worth continuing because the suggestions are so direct in that it doesn't take into account the context of a sentence. Humans (meaning: you) will be more discerning of how to structure/write it because you (and only you) will know what point you're trying to get across. Sometimes, Grammarly's english may be "politically" correct but it is still an AI and, personally, will not be able to understand the message you may want to convey. Try it for your final thesis and be done with it, is our suggestion.