Pioneer DVR-109

Better the original firmware 1.58 or buffalo 8.58?

I vote the Buffalo: it bitsets DVD+R discs to DVD-ROM, and now with the new MediaCodeEdit utility you can tweak it to remove the riplock as well. If there’s more to this someone will post here I’m sure.

where would one find the buffalo 8.58?

From HERE

With the firmware buffalo 8.58 the bisetting from dvd+r to dvd-rom is automatic?

Yes.