I've tried it recently, since it markets itself as being performant, and native-like performance is what other popular tools like Jira or Trello miss. I want to say upfront that 50ms user interactions is not what I would consider "breathtakingly fast" as the website claims. It's much better than the tools mentioned above, but doesn't really cut it for me. Maybe I'm old, but I see lots of unnecessary animations, that (in my opinion) contribute massively to the perceived slowness of basic interactions. Some of the animations are not that smooth at all, e.g. the new issue label menu color dots jiggle when menu animation finishes. I'm so tired of seeing marketing speak like "UI elegance with world-class performance" to then be only disappointed in the difference between my and the author's views on what "performance" means.

Feature-wise Linear looks great though, so I might give it another try in some time.

P.S. Can someone please explain the hate for the pointer cursor? Why some products refuse to use it for links and buttons?

edit: I reread my comment and found it sounding a bit too critical. I really think that Linear is much better that most of the alternatives in the regard of UI/performance. It's just that I hate how the meaning of the word "performance" devalued with time and claims like "50ms = breathtakingly fast/world-class" continue to contribute to that.