Swiss German is based around Alemannic dialects rendering it often and frequently unintelligible to traditional German speakers.
If by "eventually you get it" you mean "after putting enough effort into learning it", then yes. But that's the same for every language.
If you mean "you need a few hours to get used to it and then you understand almost everything", then... well... not at all.
Both things are wrong. It's not a dialect in the sense that it is not the same language with special intonation, some new words and new idiomatic sentences. It has its own (much simpler) conjugation and declension scheme. Much closer in feel to a creole.
Its written form is also not german. Good luck reading some of the züri by mike comic strips as a german reader.