I really like this plugin- I tried a few image widgets and this is the easiest to install and operate. Most other widget doesn't allow random images.
However, other image widgets are not limited to only one widget. You can add unlimited image widget on the sidebar. Some of my pages are long, so I wish to add enough random image on the sidebar, which I'm unable to do with this.
With this plugin, once you use the RIGWPPZ widget, you can't stack another RIGWPPZ widget below so that you can have more than one random image on the sidebar.
I wish they can update that....otherwise, this is a great plugin. And will receive a 5 star. It works with the latest wordpress 3.6.1