When it comes to things like "Fix-It", the adage comes to mind...
"An ounce of prevention is worth a pound of cure".
If you don't want to invest the time and effort to keep your system healthy,
then it is better than nothing at all, but only marginally so. Besides, a
product like that is reduced to the lowest common denominator, and thus
allows you very little control over what it does. Better to be proactive,
and do your own housecleaning and keep your computer operating the way you
want.
In short...my vote is "no".
Bobby