What are the requisites for RAM in a MacBook? I've just purchased my MacBook Pro (13-inch, Mid 2012) (it's not the retina model where RAM is fixed) and I'm considering more RAM. On the system information app, I found this info.

BANK 0/DIMM0: 2GB DDR3 1600 MHz OK
BANK 1/DIMM0: 2GB DDR3 1600 MHz OK


Will any RAM, DDR3, 1600MHz work or does the MacBbook have some other requirement to be compatible that isn't listed above?
Any 1600 MHz DDR3 SODIMM will work.  You do not need to buy one from OWC or any Mac specialty shop.