I have tried it once, with very mixed results. Many applications survived, some not well at all. They do advertise support for those problem apps, but that requires much back and forth with logs files going and misc. stuff coming back. In fairness, it is quick and does most of what it advertises, just be prepared for a lot of support when it goes wrong. My problem apps all came down to the same thing - broken, unable to uninstall or reinstall.