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I mainly use GSA for my second tier links and it was always a pain to fill in all the data fields in GSA , for that reason I was not using GSA for few months. I got a datapack for GSA from royalmice and though of giving it a try.
I would say it is amazing. Just follow his videos (if you are a newbie) just a few clicks and all your content needed for the campaign is DONE. My all i mean ALL except PDF which is again just a click or two. His PDFs are too good aswell.
Another amazing thing is he provides email address which can be readily used for the campaigns.
This is super cool service and well worth $10. His support is excellent too, always available to help you with any questions or followups.