Gah...as someone who has Frankensteined together PSX machines together for some side profit, who has repaired more than a few PS2s, and who also wonders what kind of inbred chimp engineered the X-Brick - I can tell you that the optics assemblies used on any console = SHIT. All of them. Well, except for the Gamecube, and that has a locking spindle for the mini-disk, so it doesn't scratch. At least one of the consoles are interested in logevity of the console/media/gameplay, as the Gamecube is the only one to survive and work after a 3 story drop onto asphalt.
$15 per unit more for a better laser assembly and you have a longer unit life, longer media life, and much longer stability given internal heating issues, which the X-Box also runs into along with the PS-2.