I had an LG 24X burner in my last QuickSilver G4, never made a frisbee, not a one, and I swore I'd buy another LG burner after I sold it. I mean, seriously, this thing burned at top speed every single time. And I burned a ton of them.
I used to think of Yamaha as the burner king in the SCSI days of Mac computing, but now I've turned to LG as the boss for CDr burners.
Just one Mac User's opinion though. Plextor may be as good or better.