I haven't looked at PerfectDisk 10 yet, because I'm in the final (and tediously slow) stages of setting up my FRAGG benchmark machine. But a blog called ITReviewed has posted a 5/5 star review of PerfectDisk 10:
Defragmenting your hard drive is an integral part of keeping your PC healthy. The defrag utility which ships with all modern versions of Windows is very simple to use and can give your PC a performance boost, but there are better third-party utilities which are faster, more effective, and offer a lot more features and flexibility. One such program is Raxco’s PerfectDisk, probably the best of its type and one utility which I have relied on for a number of years.
PerfectDisk is a lightweight software utility that helps to ensure that your Windows Vista, Windows Server 2003, Windows XP, Windows 2000, and Windows Home Server systems maintain the best possible hard drive performance.
I mention this review because readers can write their own review and submit it. I'm intrigued to know what users of the program have to say.