Apart from one exception there is some of that time, every purchase of this brand I have never been disappointed with the result after installation, whether on Mac or PC. I really considered buying another type of memory called "mark" is justified only for very specific uses: gaming, large scientific computations, 3D modeling ... (more ECC memory than mandatory). For pro or not mainstream users, these memories do the job and do it well. At the slightest problem, consider contacting the Amazon service (by phone or the return form) in the month following the purchase for a toll-free replacement or refund return with the key. Compliance of Legal Warranty is your friend then for 2 years in case of problems but to date not seen ;-)
