I totally agree! ASC is kinda tricky! You have to be careful because you could get certain instability and even blue screens with the registry deep cleaner! I did it myself and I started having blue screens and I use the "backup" feature it has and it said it restored my registry. But no it didn't resolved the issue. So I had to repair my OS. I got a free license for the pro version and NO THANK YOU I don't use it at all after that experience.
So I'm really up for Ccleaner I have used it for many years now and it works excellent. Never found a problem but besides that I used Tune-up Utilities 2014 and for me it works excellent as well never have a problem.
Becareful sometimes TuneUP does lose its mind and starts eating hundred percent of your ram without any reason. may be they might have fixed this bug by now. it made my pc go mad :/