I couldn't get it to work with a blender obj but I could get it to work with 3DSMax. It took forever for me as well. I'm running a I7-2600k with 8gigs so not that powerful but it's not that bad. For small carefully crafted meshes it could be quite useful but other than that I don't think it is up to the job. I think if one did a retopo job on dense meshes it may be OK but that would need some testing.