It was last year, so it's not in recent memory, but most of the problem was around instability. We ran into some frequent issues where we would begin troubleshooting, assuming it was something on the application end, only to find out that the issue was happening in the network. We eventually figured out that the Headscale network was randomly dropping in and out. I'm sure with a lot more time we could have identified the root cause, but unfortunately, we had a deadline and just paid Tailscale (and haven't had any issues since).

Like I said, I'm sure it's coming along fine, it's not just something that we were able to set and forget like with the Tailscale experience.