I recently bought a 50 spindle of Ricohs branded as Maxell.
They sucked greatly.
I was burning some videos on them as SVCDs so I could watch them on my DVD player, and every single one had problems playing near the last 20 mins of the videos. I could play them on my computer OK, but not in my DVD player. Also, one in 5 or so just plain didnt work at all.
I ended up ordering a 100 spindle of Taeo Yundian or however you spell it, and copying them all to those discs.
They worked perfectly on my DVD player after that.
I tested a few in the latest version of Kprobe and the Ricoh ones were getting almost 25000 errors per disk. The Taeo Yundian were getting only 2000 errors.
edit: I forgot to add, these were CDRs!! NOT DVDs. So take that for whats its worth, which may be nothing.