Seems good in general. Haven't had a chance to actually run it on this machine, but on my previous one I would get kicked from the lobby every now and then. I could log back in no problem and rejoin the game, but it was inconvenient.
As of writing this it works great however I could not figure out how to install custom themes using the flatpak, so I installed it from their website instead.
@adminBrandon...apparently, this is no longer an issue with LinuxMint 19. I'm on Cockatrice now. :-)
This is an amazing program, however it only runs on Ubuntu and not Mint, I would love to see them compile for mint soon