Hakumisoso Terror :
Hmm, if all it does is eliminate tearing, not sure if that's worth $200.
I might grab something else then.
Read/watch my links.
It does far more than eliminate screen tearing. VSYNC ON eliminates screen tearing but then you get lag so things feel sluggish. GSYNC eliminates the need for VSYNC so you get minimal lag.
There's also a few other things going on, but basically GSYNC:
1) eliminates screen tearing
2) minimizes the lag of VSYNC
3) reduces STUTTER and JUTTER
As said though, you can't appreciate it unless you use it. The experience is similar to being able to output over 144FPS but having VSYNC on and locking to 144FPS. The much higher frame rate reduces lag, and VSYNC ON removes screen tearing. It's slightly more complicated though and G-SYNC solves a few other minor things.