Used it for the first time last night. Retained heat well. I filled a sink with hot water and soaked the bowls in it while in the shower. I will try to use hotter water next time but the bowl kept the brush warm and in effect the lather.

The bowl is about 4.5" across and about 2" deep. I can flatten the brush into the bttom easily to keep it warm.

The main diadvantage is that since it is two seperate bowls it rattles when I am making lather.

After checking other threads I will try the rubber feet to lift it off the counter top.

Jim