I have had several versions of System Mechanic in the past on various Windows systems. The tools seemed very useful but there was always something that crashed either the SM software or the system itself. I eventually stopped using SM in favor of other maintenance software like Glary. I just loaded this SM15 onto my Win10 machine to give it another try. I have run it through several deep scans. So far it has worked fine and it does offer a big box of tools. If it remains stable this will be my “go to” maintenance suite. I’m tentatively rating it 5 stars and keeping my fingers crossed that no stability issues arise.