Here now is the Instant Meshes results on the exact same high poly object as shown above. I did not adjust any settings in the IM software besides reducing the desired poly count to around 29,000. The exported mesh here is not entirely quadrangular. The export resulted in just under 29,000 polygons but there were also ngons in the result. Subdividing this, of course, would solve that but I'm not entirely sure why the software couldn't come up with a pure quad mesh like ZRemesher did. The calculations here though were faster than ZRemesher. This result took less than 3 minutes on the same machine as above.

Personally, I would not be satisfied to use this output in production straight away. I would have to either edit the results manually to fix the ngons, or subdivide the object to attain pure quad topology.

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