I like that it has an API for easy integration with other services i use (like Zapier). It's also very intuitive to create your own integrations through their website! Their customer support could be better though - they are pretty responsive but sometimes there can take days or even weeks before someone replies back if you're not super urgent about getting help right away :) They have some really cool features when creating new forms which makes designing them much easier than using something else out of box such as Wufoo/Formspree etc..
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