I've now received and applied this screen protector.
In a single word, "bestscreenprotectorI'veeverused" (that's a real word, right?).
For starters, the glass didn't seem to attract what few specks of dust were in the air to it as do film protectors. It was cut perfectly which meant it was tricky to line up just right on the screen, but when I misaligned it the first time it easily pulled up for reapplication the second, where I got it right - an issue I've had with film protectors with this is that sometimes they have very light stress marks or stretching when pulling them back that can cause some minimal rainbow effect.
With the exception of a minor defect in mine, on which I'm awaiting a response from i-Blason (two unreturned calls so far - hoping they're just busy...), the few bubbles that were present on initial application swept out completely in about 5 seconds with direct strokes. Compared to film protectors, in which my experience bubble removal can be likened to one of those puzzles where you tilt a box to get a ball to navigate through a maze to an exit, this was a delight.
The defect in mine is a small imperfection in either the silicon adhesive or the interior of the glass which creates a small spot on the screen generating about a 1cm bubble. Other than that, this protector is flawless.
Outside of that, it would take close inspection along the edges to be able to discern that it isn't the actual screen itself. None of the rainbow, orange peel, or other artifacts generally found with other screen protectors either initially or invariably over time, and I hope and expect the tempered glass to stand up to actual usage without showing the wear that a softer film protector eventually does.
Oleophobic coating works well. Comparing the mark left by my thumbprint on it to that left immediately afterwards on the back (non-oleophobic) glass of a Nexus 4, the one on the tablet was nearly imperceptible, and wiped away easily.
This isn't a cheap SP, but it's not terribly more expensive than the best of the film protectors, and in addition to having better 'invisibility' it should offer more (though still not substantial) protection against impact.
Providing i-Blason steps up to the plate in terms of customer service, I'll give this a thorough thumbs-up.