OAI is far from being another Tower Air although they do fly tour operator and MAC charters. A better comparaison would be Champion Air. I flew to Vegas with both Champion & Omni and was quite pleased each time. The trip reports on this site and friends with experience on Omni have been nothing but positive, Ceilidh, don't bad mouth a company unless you know what you're talking about.
My definition of cool ? Not trying so hard to be cool.