If you just want to play downloaded MKV, MP4, or AVI files, VLC is 95% as good for 100% less money.
For audiophiles, the ability to play DSD (Direct Stream Digital) files and bitstream Dolby Atmos to an A/V receiver is flawless. The soundstage feels wider and more precise than Windows’ default media players. cyberlink powerdvd ultra
If you need to play commercial Blu-ray discs on a PC with full menus, (wait for a sale to $69.99). It is the best in class. If you just want to play downloaded MKV,