CNET Download.com
"Defraggler is easy to understand and performs its job well... if you want to improve computer performance, this is a great place to start."
Read the full review at:
http://download.cnet.com/Defraggler/3000-2248_4-10752905.html

LifeHacker
"Freeware file defragmentation utility Defraggler analyzes your hard drive for fragmented files and can selectively defrag the ones you choose. The graphical interface is darn sweet."
Read the full review at:
http://lifehacker.com/306393/defrag-individual-files-with-defraggler

The PC Guy - NorthJersey.com
"... you can choose to defragment individual files - Defraggler is one of the few programs I've seen with this capacity - and focus mainly on those most in need of immediate attention... Past free offerings in this category did not have the speed or features of Defraggler. I now count this as one of my must-have utilities."

PC World
"Defraggler will show you all your fragmented files. You can click one to see where on the disk its various pieces lie, or defragment just that one. This can be useful when dealing with very large, performance critical files such as databases... Piriform Defraggler is free, fast, marginally more interesting to watch than the default, and has useful additional features. What's not to like?"
Read the full review at:
http://www.pcworld.com/downloads/file/fid,72958/description.html