Appears to be the cheapest 144Hz 27" G-Sync monitor I can find. There are cheaper 144Hz displays, but the price for this is in having G-Sync, not FreeSync.
Only 1080p, but some people may like that for the maximum mad frames.
RRP is $999 which is a rip-off, but for sub $500 it's good value. Use cash rewards to bring total price down further.
Edit: Should say, was posted a few weeks ago as a deal at $619 here: https://www.ozbargain.com.au/node/323360
I was about to check out then this happened https://www.tomsguide.com/us/lenovo-y27g-re,review-4038.html