I really like how easy it is for me as an internal user with no coding experience or development background at all (I am just using their product)to create my own custom integrations between our applications! Really great customer support too who are always quick to respond without being pushy about sales-related issues etc; they're super friendly but have zero interest in pushing you towards more expensive plans if that's not what your business needs right now - which we didn't want anyway so was perfect :) We use them mainly because of its ease/simplicity when developing new features within existing systems rather than having developers build us something from scratch every time.
Having said this there isn’t anything i dislike specifically apart maybe some minor UI elements such as buttons needing extra clicks before things work properly sometimes? Which could be improved slightly by adding simple "mouse over" functionality.