I recently ordered and received a Tactile Turn Mach 3 handle (The Pruner) in stainless steel made by Will Hodges of Tactile Turn, www.tactileturn.com. It feels great in the hand and unlike some all metal razors, this one has a non-slip grip due to the textured handle. I love the weight of the handle as well, as it weighs in at 3.00 oz (86g). They also make a lighter titanium version, as well as ones for the Fusions, called Parers.
I also like the way it was packaged on arrival as the plastic container it was inside of will serve as a nice travel container for my handle.
The head does not unscrew, although the one shown on the video review I watched did. Will Hodges told me mine and all other production ones are epoxied onto the handle so they should stay on indefinitely.
I'm very impressed with my Pruner so far. I love the weight difference compared to the stock Mach 3 handle.