I never doubted their 'ultimate' success. [=I never doubted that they would eventually succeed]
They provide their customers with 'the ultimate in' service. [=with the best possible service]
The president has 'ultimate' [='final'] authority/control/responsibility over the decision.
(..) - Right on. You too. God. Shit. Yo, anybody home? Hello? Tonight, you will receive the ultimate mixture of cutlery... ...tonight in the steel knockout. Every phone line jammed. Eighty-nine dollars on flex pay. That's easy instalments. And, folks, the knockout is only... (..)2009 TvShow: Breaking Bad Title: Peekaboo Season: 2 Episode 6