The lighbox features in this product are fantastic, it is simple to use (just point it at a folder of images) and has all the control you need for thumbnails (gallery or single, size etc.). Plus, because it is file-based, you can use FTP or Joomla's built-in media manager to manipulate your files - a big advantage over all the other galleries in my opinion.
I have taken to using this module in conjunction with the 'load module into article' plugin. Thus, my workflow becomes: upload images -> create AUL module for gallery and point it to images -> create article to house module. Could not be easier.