The export was mostly painless. Linear doesn't have direct support for a migration from Pivotal, so you have to use their CLI tool for the import, which relies on their API. My initial attempt failed because they wouldn't allow more than a set number of requests per hour. An email to their support later and I was able to get this raised to accommodate the amount of data we have. I haven't dug deep, but there weren't any options presented to bring comments or attachments in, which is unfortunate as some of that historical context is important for us.

I'm also scoping out Shortcut. Shortcut's interface feels a bit more familiar when coming from Pivotal. Their import process is even less polished though. For Pivotal you have to send an email to them, they reply with a template .csv that you have to ETL your data into.

Right now the jury is still out for us.