Great Unbreakable Alternative to Ceramic, but Lacks Heat Retention
Works great as a shave cup, has a lip on the bottom to hold my shave soap in place.  I got this because too many of my mugs have gone for a fall and covered my bathroom floor in pieces of sharp ceramic.  The downside is that it doesn't retain heat as well.  I would fill my ceramic shave cups with boiling water from our water filter and they would keep that heat to keep the contents of the mug hot for a second application.  So I just have to make a second batch of froth if I want to lay down another coat of shave soap and have it be warm.  Which is nicer than stepping on broken pieces of ceramic while barefoot.
Rating: 4 stars