I have a 27" 120hz Acer (listed in signature), and I've found it to be very good. For the price if that monitor, assuming you are seeing the $199 deal I see on newegg, I'd get it for sure. To fully utilize it, you'll probably want to go SLI eventually, but even one can take advantage of it enough to be worth it.
If you end up with a bad monitor, you still have the warranty. It may not be great, but that's a great price for a 120hz screen. Almost half of the typical price you'd see for a 120hz screen of that size.