Remove unnecessary files (hotfix un-installers and installers, temp files excluding c:\temp, browsers' caches - plural - recycle bin, and so forth, before defragmentation. Why defrag garbage, when it gains a quick albeit minor speed increase.

The "options" are very limited, and have more to do with the UI rather than the program behaviour.

Add an entry for "disk cleanup" settings, to include deleting: hotfix installable .exe files and uninstall entries; temp files (excluding c:\temp!); browsers' cache files - and check for more than one browser cache per user, and more than one user account per PC. This is more granular than the 'TempCleaner' icon - there is nothing to suggest what it is going to 'clean', but after running it my Recycle Bin is NOT empty.

Remove the autoadded "Add GiveawyoftheDay.com to favourites (IE)

Tweak the Wizard so it actually displays useful information. It is "highly recommended" that I defrag all my drives, including one which has just been defragged with PerfectDisk, and another which is shrinkwrap new and just been installed - simply to see what PD, Defraggler, and now Jet, report... Jet has done NO analysis of these drives, so cannot possibly know how fragmented these drives are, if at all.

Expand the "Buy the ultimate version" pop up to include WHY one would want to buy it - just what does PreciseDefrag do, and why would I want it. Or is it, like the so-called MemoryOptimiser, nothing more than a cheap marketing ploy. If it has a real use, then provide a compelling reason.

Consider including a duplicate checker? Not a huge space saver, but 'every little helps'.