RAM module debate!

[evonietzsche]

Was searching about updating ram, whats really /performances diferences, and would it worth it between those kinda rams and the owc from macsales?

EBAY:

http://www.ebay.es/itm/2x-8GB-16GB-...itsspeicher&hash=item53eadba568#ht_3564wt_991

or

http://www.ebay.es/itm/Komputerbay-...tDomain_186&hash=item1c260497b7#ht_500wt_1031



VS


Macsales:


http://eshop.macsales.com/item/Other World Computing/1333DDR3S16P/




I'm wondering thats theres no should have any diferents on perfomance, or any risk, maybe temperatures, due the material components but,warranty life too.

Really worth to expend almost twice for the OWC?

Thanks, arguments will be appreciated.