Just found this program a few days ago and I like it.
Only a minor issue:
Some files can't be defragged completely and then Defraggler says :
"No files were defragmented" whereas the number of fragments for that particular file from 679 to 8. Correcter would then be a mention that it wasn't completely defragged.
Another feature which I would like is to maximize freespace, so that it a large contiguous freespace-area is being created to defrag large files. Is that possbile?