I have no use for this feature myself.
I only investigated and tested it because I did not believe it could work.
Happy to say it works very well.
I still do not use it.
I periodically use Disk Cleanup to purge all the old R.P.,
and depend upon restoring a disc image should disaster strike.
One big disadvantage for many people is the monster waste of time when Disk Cleanup trawls through the whole system so it can tell you how much space will be saved if it compresses old files.
Ever since Windows compressed an old file and Windows File Protection demanded a Windows Installation Disc,
(which was never supplied - Windows pre-installed), I have never again compressed.
I finally found a "hack" that removed the compress option and avoids that delay.
If any one else needs that hack, the answer is out there on Google - sorry I cannot remember more.
But, as "devil's advocate" :-
I doubt that even Tuneup Utilities is likely to remove the entire contents of a R.P. and leave a viable system that allows you to restore to a point in time that preceded the creation of that removed R.P.
That R.P. WAS the only repository for copies of files that were deleted whilst the R.P. was active.
Without that R.P. then any attempt to go back will not fully restore all the files and folders as they were.
On XP typically each of my R.P. is 57 MB, of which only 2 MB is the residue after CCleaner "removes" the R.P.
Typically CCleaner is 96% effective at cleaning down to the bone.
I do however have perhaps 100 MB of residue from the odd R.P. that has lived through monster security updates.
With that in mind, on average CCleaner is 90% effective at cleaning down to the bone.
I am convinced that Piriform has done its homework,
and to clean any further would prevent use of earlier R.P.
It would however be an enhancement if there was an option to completely eliminate the chosen R.P.,
AND additionally erased all the earlier R.P. which depended upon the audit trail of the chosen R.P.
Alan