Does not have GSync.
Before I can explain what GSync is, I need to make sure that you understand what VSync is. VSync will make sure that the framerete being output by the graphics card does not exceed the display rate of the monitor. If the monitor's display rate (Hz) is out of sync with the output of the graphics card, the result is screen tearing. VSync prevents this by making sure that the output rate of the graphics card does not exceed the maximum display rate of the screen.
What GSync does is it adapts the display rate of the screen to match the output rate of the graphics card. However, if the output rate of the graphics card is higher than the screen's maximum display rate, then it will slow down the card's output rate. Basically, if the card is outputting faster than the screen, it acts as VSync. But if the display rate of the graphics card is less than that of the maximum display rate of the screen, it does the opposite of VSync and slows down the screen's display rate to match the graphics card's output rate... This dramatically reduces frame stutter.
I just don't think it's worth it at the <$200 price range. You see, in order to put GSync in a monitor, the manufacturer has to pay Nvidia for a license to use a little module in the screen. This drives up the price of the monitor. If you were to put GSync in a monitor and keep it under $200, it would mean making compromises somewhere else in order to keep the price down. That's why I don't recommend GSync monitors under $300.
Please note that one Hz is on cycle per second. A screen displays one frame per cycle, so one Hz is effectively one frame per second.