I needed to switch over to this new plugin because WP ADA was being discontinued, Diana was awesome at helping me make the switch. One thing I had trouble with when switching over, was that the image thumbnails needed to be recreated which I did using this plugin: http://wordpress.org/extend/plugins/ajax-thumbnail-rebuild/ before I did that, the photos were not being cropped to the nice thumbnails and would come in vertical or horizontal - depending on the photo, making it look quite awkward.
I'm still working on tweaking the CSS to work with my theme, but overall the transition was smooth.
Also, I found a minor issue with ie and reported it to Diana, she had it fixed & updated in the repository in less than a day!
I give Diana and the plugin an A+!