As the free version has limited options, I purchased the full version. The developer responds very quickly on every question, so the support is also excellent.
We Joomla users want to get things for free (me too). When developers put a lot of time in extensions that are really helpful, I think it is right to support them.
Furthermore, the support is excellent. Forum questions are answered mostly within a day and suggestions for improvements are taken seriously. So many compliments for this great Joomla extension!