Just got and installed the invisible shield glass+ visionguard screen protector. I purchased directly from the Google store with a credit I had.
It's nice and fits almost exactly over the visible screen of the Pixel 3. Anyone who had the Spigen screen protector will remember how exactly it fit the visible display. The included guide is ok but not great, since it's flexible enough to allow the screen protector to sit a little bit askew. Not a huge deal, but the bottom of my protector is off a hair to the left and the top is off a hair to the right. Not enough to notice unless you were intentionally looking for it. No halo anywhere and the install was pretty easy.
First impression is that it is nicer than the caseology screen protector I was using before, both because it is a touch wider and it seems a touch clearer. The caseology protector was good, but this is better. That said, the caseology protector is much cheaper and this is very expensive at $45.