Original support for the original AmigaOne models and OS4 was via a couple of Yahoo groups that were so secretive and select that you could actually join them without even owning an AmigaOne or running OS4.
I know this for a fact because I did it.
Great groups. People posted issues and then the members suggested fixes or worked on the bugs.
As for X1000 support, I haven't actually needed any yet. I don't visit the website (my bad, I'm sure that I should), and I tend to get my updates from Amiga.org, AmigaWorld.net and the automatic software update.