I have to say that this is one of the best deals I have ever purchased here at Appsumo. Extremely easy to implement, work miracles with SEO optimisations and tracks development over time. The team of NYTRO SEO is top notch, there is an option(highly advisable from my side) to have an onboarding call to support you with implementation of the tool. First I got level 4 (the highest at the time, shortly increased it to 3 tier 4 licenses, and soon after I also got level 5, sodo not hesitate and jump to it while the offer is still available here at Appsumo.
oh forgot to mention that beside the onboarding 30 minutes call Lee and the team are having weekly webinars(Free) - extremely advisable too.