NESP consultants had a very thorough understanding of the PCI-DSS requirement. (The word ‘encyclopedic’ comes to mind.) This was very helpful in areas where the written standard leaves room for interpretation. In those situations, they helped us to assess our risk and to develop practical solutions.
They brought strong operating systems and networking expertise. They quickly earned the respect of, and collaborated effectively with, our technical staff. Consistently their recommendations were technically sound.