Apple's quality control has been abysmal the past few years - about the same time they started sourcing products from China.
I'll stick with my non-glare iMac that I've had zero issues with thank you very much.
Seems like a lot of people having issues are using relatively new Macs. I've never had a problem with my 2006 iMacs. One can only think that Apple's quality control has gone in the toilet the past few years - that plus the fact I'm forced to get a glossy screen means I'll never by updating to new hardware.