Support for the product is also great. I had a problem with the upgrade from Joomla 1.7 to 2.5, with the slideshow not showing. The developer, responded straight away and then debugged the pages. Turned out to be a problem with GoogleAJAXLib plugin which was set to use MooTools 1.3.0 (OK with Joomla 1.7) but does not work with Joomla 2.5 (needs 1.4.x). Changed the version of MooTools in GoogleAJAXLib, and ShowPlus now working perfectly again.
Brilliant support - thanks very much. Great product - download it!