(Sorry to be so vague, it's still sorta early here and coffee hasn't fully kicked in)
I've personally had much, much better luck overall with -R media than +R. (and I only use pretty decent discs of both kinds. I have a few Mitsubishi Verbatim +Rs going bad after a few years, while none of my -Rs have similar problems.. yet.. not to mention -R really is more compatible)
I just got an LG-4163 and tried bitsetting for the first time... it really does help +R compatibility... too bad all those drives played -R fine with no special tricks or special drive required in the first place...

