Smart Defrag
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Full user review
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"solid and robust"
Pros
it's free, it's stable, it's simple, it's doing what it promises. No ads, no limitations, no nagging
Cons
I'd probably make a few minor enhancements to UI (mostly eye candies) like an ability to see the list of files contained within a given "disk cluster", but it's so minor that it's almost not worth mentioning