I'm sure it's fine for small-scale usage, but overall it's extremely inflexible and doesn't really scale well at all. There's also a lot of very basic functionality that's straight up missing. For example, there's no way to have a global epic priority. You can rearrange epics in an epic board, but the ordering of the epics there is not persisted elsewhere. There were many, many other shortcomings we kept running into.

Oh, and after a lot of our tickets had been imported (which itself was a huge undertaking since the auto import tools are complete trash), it started to be very slow. It feels like a very unfinished, unpolished product.

We use Gitlab's CI/CD features extensively at my current job and it's very, very nice. That's what they are actually good at, not project management.