Quite so, but we already established on a recent thread that there is the classical Greek pronunciation (oh-MEG-a), Daniel Craig's pronunciation in 'Casino Royale' (oh-MEEG-a), and the way that OMEGA the company pronounce it in their marketing materials (oh-MAY-ga).
When referring to OMEGA watches, as opposed to Greek letters, Vauxhall cars, or anything else, we can assume that the manufacturer is the ultimate authority.