I like that this Jira extension works without any configuration. It provides a handy overview of all the subtasks of a common parent. All the relevant information for the "siblings" is on the same page. So I have it there when I want to see what the team has already achieved in other subtasks or what I will need to prepare for.
It's a nice bonus to have a nicely visualized progress overview of the Epic. You can get it by preparing your report, but it's just there.
In a nutshell - I recommend the plugin to every Jira user dealing with many subtasks. Which is basically everybody, right? ;-) Review collected by and hosted on G2.com.
It's hard to find the downsides of using this app. Sometimes, it may take one or two seconds until the panel with more subtasks is loaded from the server. I guess that is caused by the technology of integrating plugins into cloud Jira. I have seen it also elsewhere.
I would like to get the app entirely free when I install it to an instance with over 10 users. Review collected by and hosted on G2.com.