The HTML code it outputs is very bad in my opinion. Which by all the major Search Engines say that can/will bring down the SERPS for that
Website. In turn I would have to do major core hacks to make the output code Validate with the W3C to feel happy using this plugin.
If the Pro version has poor HTML output also, I wouldn't waste my money for it.
If this is a fluke then my bad, if not I would rather go with something like Noah's Classifieds instead.