For smaller companies Atlassian crowd is great, however, we grew to a size where we were getting rate limited so we needed to scale up. What we ended up migrating to was the non-cloud solutions for Atlassian products. This allowed us to hit our scale without being rate limited. However, at a smaller scale, this product would work great.
Overall, support is good, you get quick responses from Atlassian's official support system, and documentation is decent enough for you to find what you need.
Atlassian Crowd is just much easier to set up, plus most of our systems we use are from Atlassian, they work with Atlassian Crowd out of the box without much effort, so it ended up being the natural choice for us.
New systems are tough when it comes to an ROI, as a dollar amount for saving time on a sign-in can be tough to track. Like most new systems that makes things slightly easier to execute as an end user or manage or support, it really might come down to the existing structure of how a company manages its users.
The positives are always with the end user, which I have to say, Crowd was able to accomplish.
