How Many Members To Start With?

I was reading Chris The Prosperity Guy and his most recent entry on Mastermind Groups and how many people to start with:

The best way to start a mastermind group is to find one person at a time. My experience shows that this is a good idea. Form a two person mastermind group and then look for a third that both of you agree on and build it up to six or eight people.

From my own experience we haven't started a group with less than 4 people. You need a small group to make sure everyone gets along and can agree on the direction. You also need to have enough people to make it interesting and valuable. The whole point of having a Mastermind Group is to leverage the energy, experience, wisdom, and network of the people in your group.

We start our groups with at least 4 members and build to 8.