Guys- I am returning my 2nd iMac (i7 core) today and this time I am not going to get a replacement... I love what this iMac has offer & the screen size is unbelievable. It's a beautiful product. Unfortunately- it seems that we're asking for it based on price tag... Both of iMacs were experiencing; Screen flickering (even after firmware update) Yellow Tinted at bottom of monitor HD (2 TB) being a bit slow Note: Myself as a MAC user for 8 years now, I noticed that it depends on how you install OS X, softwares, etc. For some reasons, performance tend to be better if I installed a software then restart then do a complete update before installing other software. However with these two iMacs I had doesnt show any difference. Superdrive reads too slowly, while it plays movies fine, but it takes too long for it to read the data. I often would see files & folders inside of DVD / CD but has outline boxes before its completely loaded- even at 25 mb file size with fastest DVD / CD available. It wasnt acceptable. Audio works OK, just that it would beep out loudly once in awhile-- sort of like having hiccups. I dont know if this is the worst product that Apple has released but it is for my experience- I am simply shocked. It seems that Apple is offering bandaid solution for defects that we are finding in these 27in iMacs.. For those who dont have any issues, I am betting that they will later on. I really need the power that its offering me and who knows-- I may wait few weeks more to order again-- as new product cycle seems to be 4-5 months away & I dont know if I can wait that long. I am wondering if I ordered again and experience similar issues- would Apple replace the unit for newer model (within a year) or look for whatever they have in shock until I have no issues?