Pros: Added these memory modules to a brand new late 2015 27" iMac without any issue. Now my computer is running with 24 GB (8 factory + 16 upgrade).

Cons: None so far.

Overall Review: The simplest upgrade you can do to your iMac.

Pros: Packed well and shipped reasonably fast from Hong Kong.

Cons: Did not work in a Mac as advertised (works in Windows) Did not respond to inquiry by e-mail.

Overall Review: Appeared to be an old stock item. QC label has an '08 date stamp.

Pros: Fast delivery and packed well. Works in both Windows and Mac.

Cons: There is no instruction to configure the jumpers. Had to do it by trial and error.

Overall Review: The Asmedia chipset should have more recent drivers but the company website is non-functional.