We switched to clubhouse a few years ago. It is snappy and the UI is really nice. I particularly liked how clubhouse drives backlog curation as a largest block to smallest block. At the time, this was way ahead of JIRA. I found the team at clubhouse to be awesome too - responsive and transparent.

Ultimately we went back to JIRA because clubhouse thought differently about agile workflow than we do. At the time, clubhouse didn't support sprints other than by adding labels - but the reports didn't reflect the sprint temporal boundaries. We found it really hard to create things like a view on sprint velocity. We also didn't agree with their view on what a team is but I forget the specifics.

It wasn't that JIRA is perfect, but it was either less wrong or more right depending on your perspective.

I am a fan of the newer Portfolio/Plan functionality in JIRA which I think replicates some of the features I liked about clubhouse, in forcing a large to small PBR, but I don't use the date planning features.

You probably know this, but sprints have been added to Clubhouse, and they've tinkered a bit with teams and projects to be more sensible.

I knew about the changes to sprints (iterations?), but not the other changes, I'll take a look - thanks.

I can't see us considering a migration to another tool for at least a few years.

Edit - doing to considering

I never took web ui performance seriously as a topic until I started using Jira cloud.