Dear Piriform,
i'm a big fan of your tools and recommend them as often I can.
At this point i'd like to share my experiences:
I'm using your tools on WinPE! Except for Speccy, that crashes when with a "read" exception when reading Audio information, Defraggler works fine, CCleaner doesn't make sense as there's no offline system selector.
What I miss is, that I couldn't defrag pagefile.sys or System Restore from the offline system.
As a last thing I'm noticing quite often, that some users of CCleaner run the Registry tool: Run, Backup and Gone without to know what they're doing. I could sleep a quite bit better when you could hide that tool into Tools section or whatever, where the default user doesn't look and click around.
Greets from Germany