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Full user review
"I find this product very easy to use, and works well."
It seems to do the job and the Auto defrag is a very unique and useful option.
None at this time.
I read one comment where someone stated that Defraggler was a better defrager. I installed that product and compared it with Smart Defrag and the windows defrager. Both seemed to leave some files fragmented, and my experience resulted in Smart defrag performing the best.