I have been using this software for over a year now and look forward to the weekly update. I can readily see if my top keywords have improved and also if the have slipped a notch or two, allowing me to take immediate corrective action.
I can also view the number of the backlinks I have and who are my referring sites are. The software also has a submission engine included that you can submit your website to to get those cherished backlinks to your website.
You can also track social networks that mention your site and see the page rank of all your indexed pages.
Overall I would give SheerSEO.com software 10 out of 10.
Check out the site here: www.sheerseo.com