I used the Schwarzweisskeramik scuttle for the first time this morning. Before my shower, I filled the scuttle with hot tap water and also turned on the electric teakettle that I have to boil water in the bathroom. After the shower, I dumped out the hot tap water and filled the scuttle with boiling water. The scuttle takes about a liter (as I said before, it's huge. The pictures on the web site give no sense of perspective). I put Cella soap in the soap lid that is included. The Cella soap is soft, so it molded easily to the shape of the lid. I can see that, with this system, I'm going to use a lot less soap compared to lathering in the same bowl with the soap. The lather stayed hot to the very end and I got a great shave. I can't say anything about the Moss, Georgetown or Dirty Bird scuttles because I haven't tried them. I chose the Schwarzweisskeramik because it looked like it could do the job and I wouldn't have any import hassles (I'm in the EU). Bottom line is that I'm very happy with this scuttle.