I have a nice IPS monitor, which is pretty, but have been sitting on the idea for a while now of getting a secondary that'll give me good responsiveness and low ghosting, pushing frames >100Hz with Adaptive-Sync. I liked the look of a lot of these monitors, but sided with this one from reading up a while ago.
Obviously not for anyone who doesn't want to go back to TN.
Just FYI, ASUS has just announced the VG259Q (IPS, 1080p, 144Hz).
No Idea on exact pricing, but it's expected to be released in Jan 2020