I like the plugin and used it for a reflection on my homemade "sphere".
I noticed that when I tried to reflect a circle I got a few pixels that changed from the origonal color i assigned them to clear. This happened at the junction between the "bottom" of the object and the "top" of the reflection, and only really affected the top of the reflection. It was easy to fix (just colored the pixels back) and in my opinion does nothing to take away from the usefulness of the plug.