Don't let Tigger scare you. The microA1 "C" hardware features _do_ indeed work with OS4. USB/DMA/IDE/Ethernet/on-board graphics/sound, etc...
Well, they do now, yes (at least with OS4, although not with Linux, as the Linux authors don't want dozens of workarounds for the A1 hardware flaws entered into the main source tree).
That is part of the reason OS4 is ~3 years late - the time it's taken them to work around the broken aspects of the Articia.
But this is completely irrelevant now, anyway, since there are / will be no more A1's, unless you can find one second hand (and if you do, I wouldn't pay more than £100 for it, with OS4).
The biggest problem has been Eyetech. The closest they have ever been to hardware production is printing out stickers for Terons, DCE scandoublers and G-Rex PCI busboards (sorry... I mean AmigaOnes, Eyetech INSD2 scandoublers and Eyetech Predator SE PCI busboards)... No wonder there have been problems.
At the end of the day, anyone stupid enough to pay $800+ for one of those things got what they deserved. I have no sympathy.