There are no bugs only claims. I've read the specs for the Atricia S since some months back (allmost a year) and I haven't seen DMA mentioned for the Atricia S. It's handled in software, not in hardware.
The AOS 4 driver works. It is 100% reliable.
It is picky about the RAM-chips being used. Except from that I haven't seen any problems and I use regular PC-stuff with different brands. I've tried three different gfx-cards, different soundcards, network-cards and so on and they have all worked.
There are more claims than truth. The only thing that is true is that it's picky about the kind of RAM-chips being used. That is easily solved. Just buy the brand that works.