The interface is simple and clearly laid out. You can view and run daily, weekly, and monthly cleanups by clicking a button and then checking the results in the console window. The program usually runs quickly, but can take significantly longer if your system is in disarray.
Although MacJanitor is a one-trick pony, it performs its sole task with ease. A more extensive feature set would be a welcome addition, though. We highly recommend this program for laptop owners or energy-conscious users who shut down their computers frequently.