I used it for the first time because my favorite San Myshuno apartment is a "Needs TLC" one which was fine when she was starting out, but it annoyed me that she couldn't 'renovate' it and make it more like a home for her and her new family, so I downloaded mccc to help me fix it along with a mod to help remove hidden lot traits. At present, I only use it to fix things in the game that I think are a pain in the neck. (like all the npc's running around in CC hairs and mismatched clothing that I'd never chose for them) but its quite handy and can be configured to be as useful and/or intrusive as you want it to be, or you can choose to let it run without doing much of anything at all.