
Flosum has many strong points to consider it as a best release management tool designed specifically for Salesforce.
Best feature is that, Flosum supports Lightning components which all organizations have migrated already into.
It is easy to use and does not require any coding to work on and is completely built on Force.com platform. This does not require teams to be trained as anyone with knowledge on Salesforce can use it.
Use of snapshots to track the changes done on metadata.
The code comparison between orgs is meticulous and save a lot of time for developers. This helps orgs to be in sync with each other from all the modification done. Merging branches is effortless as well.
Impact analysis in deployment prevents code overrides in Target org, reducing post-deployment issues to some extent.
There is facility to integrate with Jira, ServiceNow etc for code review purpose. It can also integrate with Git-based version control systems.
Since, it is developed on Force.com platform, no information is moved outside of platform, providing 100% security to the organization. Review collected by and hosted on G2.com.
For now, I did not notice any issues. This is a great tool for release activities, saving lot of times for developers. Review collected by and hosted on G2.com.