I do not have any experience with Perfect Disk..but I did check it out on their website. It looks like a good solution. Of course it looks good…it’s their webpage;) I do use Disk Keeper on my network PC’s and have used it for about 3 years with good results. I like Disk Keeper because it is very fast and efficient at defragmenting HDD’s. It is also very affordable for what it does. If you decide to use Perfect Disk I would be interested to hear the results you get. I hope this helps.
I believe the perfect disk and disk keeper are good utility software to use. However, keep in mind that each of these software has their own special features which are unique from each other. Now, you have to choose the one that has special features useful for your needs.