Buying an Asus ROG is about as "safe" as you can get if you want robustly overengineered reliability and performance. But it'll cost you - although in this instance, for the time being, competing products with similar specs will cost just as much anyhow.
I'm of the opinion that >30fps can't really be seen, and >60fps is really just a benchmark - although, of course, more fps means more of a buffer against performance slowdowns. And 120fps (at 120Hz) basically only requires <7ms pixel response times. And paying a premium for G-Sync (or FreeSync) is senseless unless you actually have compatible GPUs and you're gonna actually use G-Sync (or FreeSync). Many people play older games which today's hardware can easily churn out at insane fps rates, but this monitor's 2560x1440 resolution can strain older GPUs on newer titles.
Be aware that the Swift basically factory-overclocks the G-Sync module. So performance >120Hz (up to 144Hz) is not always as easy or pretty as advertised/expected. And multiple Swift monitors are limited to 60Hz (because of GPU and DisplayPort 1.2 bandwidth constraints). It is a truly superior monitor for displaying motion (and it still looks phenomenal with graphic quality settings turned down a notch, if needed to maintain fps, because of the raw number of pixels in your face) but it won't present still-image quality or colour depth comparable to a true IPS-type panel.
"All opinions are not equal. Some are a very great deal more robust, sophisticated and well supported in logic and argument than others." - Douglas Adams
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