My LTR-52246S is fine with the Made in Mexico, 10x rated (note: not the new 12x rated) High Speed Verbatims and is perfect with the 24x discs.
That guy should have tried using MTKFlash to revive the drive before returning it.
As Action Jackson said, it was probably InCD combined with bad discs.
Notice how he didn't bother to try using a cd-r with it, only RW.
e6400 Core 2 Duo @ 2.13ghz
GeForce 7600GT 256mb PCI-e
2gb DDR2 667mhz Patriot ram 1.8v in d/c
Gigabyte GA-965P-DS3 F10 BIOS
WD Caviar SE16 250GB SATA300 7200RPM 16MB Buffer
Samsung SATA2 80gb 7200rpm
Samsung SH-S182D 18x DVD burner