Most unlockers modify memory registers. Antivirus software (Windows Defender, Malwarebytes) will almost always flag these as "HackTool:Win32/GameHack." While 90% of the time this is a false positive (because it is a game hack), the 10% chance of a real trojan is not worth losing your PC security.
The ability to explore new locations and face new enemies, extending the game from its original 30-40 hour run to well over 100 hours of total playtime. Risks and Considerations
Stealing your passwords, credit card info, and personal data.