SEMRush is brilliant. This is better.
Overall: I don't have time to be a full time SEO specialist. Big, well known tools are getting to the point where they're just as complicated as the algorithms they're trying to decipher. Semactic does away with ALL of the complexity, and just tells you what you need to do to improve your SEO, task by task. You can spend your precious time implementing the right changes instead of badly interpreting too much data and then getting the implementation wrong. Pros: It's so easy to use - you don't need to be a data analyst anymore, you just need to implement what it asks. It's brilliant. Cons: It's still a relatively new tool so it is evolving all the time - there are a few glitches, but nothing is bad.