So, to sum up the testing in all three auto retopology applications:

Zbrush with ZRemesher: 12 minutes to complete, 27,000 polygons, all quads, clean usable mesh.

Instant Meshes: Less than 3 minutes to complete, 29.000 polygons, mostly quads with several ngons, usable with subdivision or manual cleanup.

3dCoat with Old Style Quadrangulation: Less than 2 minutes to complete, 21 triangles, 127,968 quads, and 2 ngons, I wouldn't use this mesh in production.

Mileage will vary, but there you have it. If anyone has any other automatic topology applications they would like to try on the same model, let me know. I don't have access to any other automatic topology tools at the moment. I don't think Blender has an automated retopo feature currently. Blender uses semi-automated techniques with the grease pencil tool, but that's not the same. The only other tool I know of is this one:

http://igl.ethz.ch/projects/sketch-retopo

However, that is not fully automated retopology either as far as I can tell. Also, it seems to require compiling?

Edit: If you download the source code of the Sketch Retopo project I'm linking to above, there is a binary installation file in the zip. Just in case anyone wanted to try that software out.

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