Most reports and studies written about the impact of the Paris Declaration seem to come form the perspective of donor countries. Some examples of these would be: http://www.cjld.org/file/Publications_files/PEMD%20GRANT%20REPORT.pdf and http://www.oecd.org/development/evaluation/dcdndep/41807824.pdf
It would be worthwhile exploring what fellow researchers have discovered in relation to the impact of the Paris Declaration or even its "appropriateness" as a reform initiative in supposedly improving the implementation of aid.