DVDInfoPro is one of my favoreds, specially since now you can scan with Pioneer drives. However, I think there is still a minor bug that needs to be fixed. My observation is that when large spikes are present, almost always the peak PI and the peak PO are the same number. What is more strange is that frequently I see the number 693 as the peak for both PI and PO on many different DVD-R media by even different manfacturers.
I'm hoping that this topic catches Nick's attention. I'm very grateful to him for this very useful tool.