I've been a Guru fanboy for a while ever since using it at my last company!
- What I love is the ease of use, the chrome extension is very powerful, but UI is easy to navigate.
- The ability to bulk manage content in terms of who's reviewing, how often, what is verified/trusted, etc. (it's a long list and a valuable one at that) is very valuable
- MANY different types of content supported and ability to embed cards in other content is pretty darn cool; neat use cases are possible like embedding content into an LMS lesson
- Support is also great! I've sent in bugs and they are so responsive and personable -- as a support person from many walks of life and industry, the bar is pretty high for me to be impressed and Guru nails it! I don't think I've ever waited more than a couple hours for a response -- definitely less than 24 hours and they are great at following up. Review collected by and hosted on G2.com.