Hearing Anand interviewed on Linus Tech Tips' stream tonight was interesting in regards to gsync. They couldn't get gsync working on any card but the GTX 760. Trying it with a Titan, 780, 660 etc. all caused system hard-locks and crashing etc. Must be why we still have not seen these modules released and have no concrete info on a release date for the Asus monitor releasing with the hardware pre-installed; the tech is still being worked on.
Also, they both said apart from gsync functionality, the Asus monitor looked like trash and low-budget. Both decrying the lack of any announcements of decent monitors getting the functionality and Linus mentioned he'd of preferred to see a 1440p panel shipped out to reviewers so they could of seen a use case where there were real demands on the GPU to help highlight gsync's benefit. This seems to be the chorus from several reviewers, that it just is not a big deal if you can run games at high frame rates and really shows its benefits between 40-60fps if you fluctuate there. It also doesn't work at all below 30fps.
I'm not getting the 1080p low budget TN launch. This seems much more appropriate for a good 2560x1600 or 2560x1440p IPS screen where you very well may not be able to hold 60fps unless you are running multiple 780/290x/Titan/290 cards. If you're playing at 1080p, just get one of those aforementioned cards and rock 60fps constant.
Putting this in a crappy screen like that Asus, or any TN for that matter, is like putting lipstick on a pig.