Express extreme exclamation; 'extremely', 'unbelievable', 'unsurpassed'.
Long explanation:
The ~といったらありはしない grammar point is used to express an extreme state or condition, often in a praiseworthy or exclaiming manner. It can be translated as 'extremely', 'unbelievable', or 'unsurpassed'. The formation is typically used with nouns or na-adjectives.