Your Demo is Broken
http://www.webassist.com/framed.php?title=PowerGallery&page=http://powergallery-demo.com/
Gives a fatal error.
I have asked this many times - IF you could allow for us to use an unbraded (Webassist branding confuses client -or they do not want to pay us for the gallery since they see your pricing) or install a demo on my site, it would be easier to sell one of these.
Like the Power Store and Gallery but can not sell these without (unbranded) demos.
Also I guess these will be upgraded to MYSQLi (if relevant) ?