Fast, Reliable, Comprehensive, Tons of Great Info for SEO professionals , Great Price
I'm not sure about cons
I was also beta testing group so i had a peek-eye before launching. It had some minor usability problems but now they are resolved.
I think it's one of the best tools for this type of website analysis. It works great for crawling big websites, it has lots of SEO check-ups, you can find almost anything there.
It works pretty fast for crawling the websites and the price is unbeatable.
It's the only one I know that gives you the page speed score from Google.