What do you like best about the product?

The easy to use interface makes exploring known and discovered vulnerabilities fairly painless. The fact that the solution to exploits is listed right next to the vulnerability overview, it makes remediation a lot easier.
The number of plugins covers a wide variety of systems and possible exploits.
SAML / SCIM integration is another plus and was fairly easy to setup.
Implementation of scanning via its Nessus agents was a breeze.

What do you dislike about the product?

The plugin manager could use some work. There are often several plugins that do the same thing or just plugins that do not provide the functionality that they claim.
Additionally, some of the exploits that are not exploitable and can cause false positives. For example if I have a HTTPS exploit on a version of a router / switches firmware, but HTTPS management is turned off and only SSH management is used, then that exploit does not need to be listed as high.

What problems is the product solving and how is that benefiting you?

Provides vulnerability insights for servers and user endpoints with a fairly lightweight agent.

The ability to do very targeted scans of specific vulnerabilities throughout an organizaiton or on just one specific machine is very helpful.