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. Review collected by and hosted on G2.com.
They recently released a new Roadmaps product that is promising, but by their own admission, still in Beta. I've not used it extensively, but it is promising. The one big thing lacking for me (that they've said they're likely going to add in the future) is a sort of backlog view or tool for idea sorting and ranking. Review collected by and hosted on G2.com.
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