A 1440/144 G-Sync isnt cheap. But I guess your gaming style will dictate whether or not it'll be worth the investment. It's @1.7x as many pixels as 1080p, which is a considerable drain on a gpu, so you'd be a better guage of fps with the games you play now at 1080p. Cut your current fps by @1/3. If that's acceptable, and detail settings are acceptable, go for it. If not then you'd have to decide if it's a investment for a future gpu upgrade to a 2080 or similar. You'll have to be able to justify the expense because as is, with a 1070ti, it's pushing it.