The only issue I've encountered is that the pages make a LOT of mysql queries; combined with the other queries on my pages, some pages are making 80-100 queries (and yes, I've checked that the majority are from Joomgallery). So if you have hundreds to thousands of images and several thousand visitors a day, the number of queries may become a problem, as they have for me. But my solution was to re-code some of the gallery pages myself to be specific for my site. My pages now make 1/8th of the queries, but I still get to enjoy all the wonderful benefits of JoomGallery :)
Thanks for the review. If you have any problems or suggestions for future please feel free to get in touch. We alwyas listen to the requirements of our customers.
Also, new versions of all 3 Freestyle Joomla products will be released later this week.