This system is an for a serious project, but it is not a "magic button." To make a successful game, you will still need to provide your own 3D assets (buildings, cars) and ensure the scripts are compatible with the latest Roblox API updates. To give you a more accurate review, could you tell me:
Most versions are scripted to handle high player counts without server-side lag. Roblox - Advanced FiveM Games System
Many versions sold on third-party sites are stolen/leaked code, which can contain backdoors. This system is an for a serious project,
The ultra-realistic UI can sometimes feel out of place with Roblox’s blocky aesthetic. Roblox - Advanced FiveM Games System