I've been following the MarketMuse blog before they came to Appsumo, it's high up on my bookmark list. I was surprised and delighted to see them here. They've removed a lot of restrictions and changed the workflow to make it better for small businesses and freelancers. This deal is perfect if you create content, especially written content.
It's worth the price just for the office hours -- it's like a masterclass in content strategy.

Jeff should publish a book about content strategy then run for president :)