Just horrible to use. Nothing seems to work properly. Maybe I'm not doing it right but I have no way to tell because there's nothing in the way of instructions in the interface. You have to just guess at what things do or are supposed to do. Embedding videos or pictures with poll answers doesn't seem to work. There doesn't seem to be any way to customise styles despite this being listed as a feature. And you need to customise the styles because the ones provided are awful and archaic-looking - I remember seeing nicer-looking geocities sites.
I can only assume the free wordpress version is deliberately borked to try and get you to pay for a pro account. Well, it hasn't worked in this case. I'll be steering well clear of polldaddy.