This soap is free - just pay shipping (around $2.99). Some experimental soaps don't quite make the cut and this is one of those. It's good but not stellar, and it feels like a shame to waste it. So if you'll pay the shipping the soap is yours to enjoy. Limit 1 please.
Formula 16.1 was an attempt to improve initial & residual slickness. While the slickness of the soap is good, the lather is less dense than I would like. It's a perfectly serviceable soap for those who can appreciate a lather on the airy side, but I prefer my lather to be more dense. For that reason this soap didn't make the cut. It is, however, very easy to lather.