Avion allows me to create user story maps by the book. Literally, the book User Story Mapping by Jeff Patton. Many other apps allow you to create user story maps, but they're largely unstructured (e.g. Miro, Lucid) and very labor intensive. Additionally, I like the ability to integrate (or not) with Jira. My Avion use varies, but when I'm story mapping, I'll use it several times a day. Avion support is quick to respond (usually <12h) and thorough. They have an in-app chat bot that will route your request to a human when necessary. Additionally, they made it easy to submit feature requests (that they actually review). Implementation depends on your integrations. The Jira integration can be a little overwhelming for the uninitiated, but the docs are thorough and will guide you through it.

Avion bridges an important gap between customers and IT. It's customer- and experience driven and enables product owners etc. to easily build a visual map of features required. It's an intuitive tool which is easy to use and no too tech-heavy. Write user stories and define roadmaps and releases to get a good overview of your product. Sync with Jira, DevOps and so on for easy collaboration with development teams. Setup and maintenance is very easy indeed with clear user roles. In addition to the tool itself, you cannot find a nicer team to work with than the guys at Avion.

I really liked how easy and functional it was.