I have a chubby three. It's a massive brush and it takes a lot of soap and water to get it going but once going you can shave a platoon with it. It can be a real soap waster too. I prefer to use mine with a hard soap that way I can better control the amount of soap it eats.

If you use it with a soap that is challenged it can be really difficult to get a good lather but with a quality soap it will explode.