Hi guys,
Jon Hall from Grade.us here. I stumbled onto this page from Google. Obviously, I'm biased, but I thought I should weigh in at least a little 
Both Grade.us and GetFiveStars are excellent solutions, and the decision between them will come down to what you're looking for. Grade.us has an exclusive focus on marketers and agencies, and so may not be the best fit for the OP. But those who prefer Grade.us generally value our:
- Fexibility: setup, configure and white-label campaigns on a per-client business
- Effectiveness at generating reviews on third-party sites: create highly efficient, conversion-optimized review funnels targeting review sites like Google and Facebook (as opposed to internal “feedback”)
- Pricing: we’re hard to beat
- Crawler-based monitoring: we have the most comprehensive review monitoring platform in the industry covering not just major but minor and niche sites
- Review amplification/SEO tools: schema-fied "Review Stream" Wordpress/Joomla/Drupal plugin that pulls in your latest and greatest reviews from around the Web into your website as SEO-friendly content and automates sharing them to social media
- Advanced, always evolving stuff: SMS review invites, review email campaign tracking and automation, etc.
Hope this helps! I attached a short video demo, too. We're just starting to engage here at Moz, but we're always around to answer questions, demo the product, etc.
Jon
