We chose the Flex tool from EC Sourcing Group, Inc to use at Pitney Bowes. It is very intuitive and easy to use. It has really caught on here. EC Sourcing has excellent customer service and offers tools at a good business value. They provided us with a great explanation of how to use the Flex. As you continue using it, you learn more about it. We've been using it since June, and we really like it so far.