I have a bunch of cheap media (picked up a few 50-pack spindles at $9.99 canadian each), and thought I'd chime in with how they burn on B7S9.
First is AN32. I've not been able to find out who the actual manufacturer is for this stuff. 4x -R media. It's not a scan to brag about, but really it's not so bad considering some of the scans that were reported in the past on this media.
Then there is Yi Jhan 001, Taiwanese 4x -R media. A little better than the AN32 stuff. Sort of interesting how it's backwards from some cheap media. Worst is at the beginning, and steadily better reads as it progresses with no end-spike at all.
Neither scan had any scandisc errors at all. Both types of discs work just fine in my cheapo standalone DVD player - no skips, no pauses. All in all, this drive and firmware seem to work well with the low-end media.