Tripwire: an incomplete solution for PCI?

Tripwire announced today that AirTran uses them for PCI. Here is a link to the article AirTran Airways Selects Tripwire Enterprise for Continuous Data Center Compliance The press release title is just marketing fluff, if you jump into the article it says the bought it for PCI. It is also interesting that ArcSight announced AirTran as a customer for PCI also which is using their system. Why would a customer buy both if Tripwire met all the requirements?

Solidcore’s PCI customers like Convergys, don’t need to use anything else across network, databases and servers for the PCI requirements.