I've recorded this timelapse doing a retopo with Retopoflow on this character I'm working, to briefly demonstrate how awesome this tool is. What I really loved about this tool is that it allows me to focus just on the topology and where to place the loops, I don't have to worry about extrude polygons and things like that. This is a tool that any artist who do retopology must have, it makes this process so much easier and enjoyable.