"By clearing the buffer pool, using the command DBCC DROPCLEANBUFFERS, we ensure any data is read from the underlying physical disks, and this is where we want to find any errors."

This sentence is enough to dissuade it's use for me. On a production system that is running 24/7 dropping the data buffers would be terrible for performance. My understanding of DBCC CHECKDB is that it doesn't pollute the data buffers with its reads. Those reads are marked as 'can go away first' so the memory is reused as needed. Obviously Paul knows more on the workings of this but beware of DROPCLEANBUFFERS on a production system.