Something worth noting that is along the same line is. I was told that you should avoid sales people that have come from very well known companies like IBM. The reason for this is they aren't the ones attracting the clients. The IBM brand is what is attracting the clients.

This is not to say there aren't good sales people from well known companies, it's just that they probably had it pretty easy so they wouldn't know what to do if they had to fend for themselves.