The retractable housing is the same size as around 9' of Fly climbing line daisy chained. I can show a picture of it tomorrow.
I have been using the RopeTek SideWinder (RSW) for a while now, it is really growing on me as I was a bit skeptical at first as well. The beauty of it is, that it keeps the entire lanyard retracted anytime it isn't at use, yet pulls out easy. My concern was that when you went to tighten the lanyard that the tension from the RSW unit would make it difficult to pull the cord away from you, this isn't the case at all. It seems to have perfect tension, it takes the cord up willingly but lets it out easy as pie.
You can tend the lanyard tighter or looser and the amount of slack on your hip stays the same all the time. I have been waiting with baited breath for Paul to launch this idea. I think a lot of people will be really excited when they see the RSW in action.
I am working up a video as we speak. Got the day off tomorrow, so weather permitting, I will be ticking off a bunch of items on my to-video list!