I just got me a 812s. My (wifes) cdrw failed so I decided to get (her) a dvdrw.
I had a hell of a time burning to -r with this burner (haven't tried +r yet)
Some time ago I got a cakebox of 4x princo -r's and never had a problem on my pioneer106. They all burned at 4x, no worries.
So, 3 wasted dvd's later at reduced burn rates, I think check the firmware!
Now 4x on these princo's are probably not fast enough for this burner.
Just wanted to share my experiences today.
(I haven't posted for some time so....(great forum))