Girls, what's your honest opinion on cheerful guys?

Several of my friends (both genders) have told me they enjoy my company, but that's mostly due to me being funny or just doing something out of the blue that would be amusing to most. But there's one part of my personality I've always doubted whether it's annoying or not; I'm usually always cheerful and lively.

Please tell me your honest opinions: Do you find that /less attractive/ compared to more composed guys? Not "serious", just laid back compared to the usual excited-ness of people like me.
Girls, what's your honest opinion on cheerful guys?
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