This market is plagued with promises, Mailshake simply delivers better than anyone, I too think the price point is respectful but not only for the app, it's value also comes from their content which is both timely and extremely well written - hat's off!
As the Head of Customer Success at Mailshake I utilize the Cold Email Analyzer daily. We offer campaign reviews to help our customers succeed with email outreach and 99% of what we say in those reviews is also reflected in the cold email analyzer. It's an incredible way to help customers succeed with cold email, it has data points from millions of campaigns and is constantly updated.