The initial setup is definitely easy, but I wish additional setup would have a graphical interface. Notably, changing or removing a passphrase, both of which should be tucked away somewhere in the settings.

Your current options are gnome-disks and cryptsetup, and the former simply didn't work with long passphrases last time I dabbled with it.

It's also quite difficult to encrypt an existing setup without formatting the drive. You'd need to unmount your root partition, and since you can't do that from a running system, you'd need to boot off of a USB stick first. BitLocker is definitely easier in that regard.