My chief negative response is to the fact that the tools are "small," "medium," and "large," with no adjustments possible. But someone else may find this uncomplicated instead of limiting. If you want to do funny, neat, and sometimes striking things to your photos and images without having to learn the details of a more conventional image editor and proceed step by step, Deformer may be just what you want. It's like a sophisticated image editor with on/off switches, or a graphics-effects wizard that takes care of the details for you.
Review details