To use or not to use VSync

Question

I'm deciding on whether or not to use VSync for a new game that I've been developing using OpenGL. The goal is to provide the user with the best gaming experience, and to have a good balance between performance and quality. This game is designed to run on both older (Intel/Netbook) computers and newer (NVidia/i7 desktop) computers. I am aware that the purpose of VSync is to prevent tearing, however; I have never been able to reproduce this tearing issue even with VSync turned off. To provide the best experience; should VSync be turned on, or off?