I have version 2.14.706 now, and I can't say I am impressed, not with this version, not with the previous one.
I use Windows 7 Ultimate with SP1, 3 Gb RAM, my HDD was 6% fragmented.
However, the previous version took ages to get anywhere, never got it to complete a defrag, and this version is as bad.
It has been defragging for 11 hours now, and is still on 78%, while the remaining time keeps going up, it has gone up to 16 hours and 30 minutes now.
I think it was a horrible mistake starting to use defraggler and in my opinion, it might be best to just ditch it.