Oh, there's a story behind my experience with this service! They were doing give-aways at SaaS-Invaders and I am always eager to play with new tools.
The funniest thing that I completely forgot to apply my promo and it was expired by the end of the month. I didn't feel like paying for an unbacked horse but I wasn't content with the freemium either as it cuts down results to just 10 or so (URLs or keywords).
I contacted with their team via support (big green button with question mark) and simply asked them to give me testing period. Which they did.
Now I'm using Serpstat in Lite (costed me $49/mo, now they reduced it to $39/mo) which is enough for doing SEO for my clients.
As to the tool itself, it lacks databases like you would get from SEMRush but irreplaceable for pages analysis. Among other issues is that it sometimes don't have new sites in it's databases even some time after they get indexed

PROs: cheap with good support. Can compare pages for keywords.

CONs: fewer databases.

P.S. They launching site audit feature to extend their services. I hope it would be included to my plan:)

I use to find the statistics on my clients sites. http://excitedlinks.com/