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SumoMe is, I'd admit, as good as they think they are. You must follow my directions here to integrate with Marketo.
OptinMonster works, too. Again you must customize the code to correctly integrate with Marketo, or you'll end up with standalone leads with no activity tracking.
Thank you! We're looking at OptinMonster -- any suggestions as far as customizing the code, or is it pretty self explanatory once you're in it?