Very easy to configure and customize - it really adds a nice touch to the website.
A great range of options - to show data on frontend (and reset in admin), change width, colour scheme, control the poll's behaviour (allowing multiple votes, for instance). I found it very easy to set up - and the GreatJoomla site has sufficient instructions.
The voting itself is much simpler from the user's perspective - no boxes to check, no buttons to press. Instant and easy.
Daniel's customer support deserves a special mention. First of all, he reacts immediately to forum posts. Same goes for contact form messages - he got back to me straight away and was incredibly helpful! My minor issue (re customization) was sorted in a matter of hours.
I look forward to testing and using other Core plugins - it is an impressive range of useful, unique and nice looking plugins.