I have a scanned mesh, and a similar object with a reduced mesh and fine topology. I intended to do a simple retopology (and mesh reduction) of the scanned mesh, by attracting the reduced object to scanned mesh target. Unfortunately this strategy doesn't work: the global "attract to target" keeps the number of polys of the attracted mesh but does a remesh and ruins topology. And the attract brush doesn't work without enabling refinement. I hoped that without refinement it would simply attract vertices to the target...
I finally solved my problem by modifying the shape of my reduced mesh roughly to the shape of scanned mesh using soft transform (I LOVE this tool!), and finished the job with my own Unificator