I use it myself. It was not updated for a few years, after being released, but they finally released a new version last year.
It does a very good job of cleaning junk files. The PC Boost feature, disables a lot of unwanted startup items, but I do add some items to the ignore list, rather than letting it remove everything it wants to. The free version has advertising for the paid Pro version (but you can often get this as a giveaway). The paid version includes a driver updater, Clean Master Driver Booster, which is the same as Wise Driver Care
Clean Master works well, but I would recommend using Wise Disk Cleaner instead of this, as aside from privacy concerns, it has a much better user interface.