iobit system mechanic will wreck your pc in minutes , just like uniblue and the ashampoo suite! boostpeed I have used this for more than a year , and you can optimize your pc really good with this , so it runs superfast! it has a backup centre , so you can undo all of the changes you have made with the program inmediately , when something goes wrong , the same goes for iobit advanced system care ( which I currently use ) give it a whirl once a week and your good to go.....
i may be mistaken here, but just my opinion.. a lot these system optimizers actually keep running in the background and use memory which i find ridiculous.
you would be better for using ccleaner in auto mode when pc starts + ccleaner enhancer.
Out of all the options, if one must use, I would suggest ASC 6. But then again not all features from ASC are fully reliable, even on paid version (although free version is fine as it is).
Tuneup was good back in the old XP days.
Likek many suggested you could easily optimize your system manually with several tools, no need to go for a full suite.
@Umbra: if I am not mistaken, since Perfect Disk 9 or 10, they introduced a way for all users who do not wish to have the services running in real time even when PD is not being used to be set to Manual and by executing the modified PD exe, it would start the services.
Alternative, you could easily create a script to start the 2 processes and then PD exe (you can use my vmware script as a base).
Only reason I still use PD is due to VSS. Puran Defrag has settings for VSS but I learnt it the hard way for not being fully reliable.