"A disposable wireless system that's cheaper than renting a professional one for a day."
The '200 foot operating range' is a best-case, line-of-sight measurement. In a typical room with people and obstacles, expect a usable range closer to 50-75 feet before signal dropouts occur.
This is for someone who needs a temporary, throwaway audio solution for a single, non-critical event like a kid's karaoke party. It makes sense if the cost of renting a proper microphone system exceeds this purchase price.
Anyone requiring reliable audio for an important event like a wedding, church service, or paid performance should avoid this. Its fixed frequency is too risky for any professional use or in any area with potential radio interference.