The voxel and quad remesher options have been available in Blender for a while now, but they're really only useful in a sculpting workflow.  The results aren't actually that great for low poly retopology, although I guess you can use it for that purpose in some cases.  In my experience, the creme of the crop among these auto-topo options is the Exoside Quad Remesher addon.  The results which that addon can provide are nearly as good as some hand-modeled topology, if you use it correctly.  It's really the best solution on the market today.  It's so good, Pixologic have used the technology for their Zremesher in Zbrush.  I've actually been able to retopologize some very complex 3d shapes and designs with near hand-modeled results, in just a few seconds with Exoside.  Great tool.

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