Got a few for my nexus 4 last time it was on sale. Not too shabby.
1) the edges of the protector might get dusty if you're not careful, since the nexus 4 curves down near the very edges of the screen.
2) may not work so well with some cases. My original $5 s-line case kept peeling the edges, but my new diztronic case doesn't peel and actually hides the edges well
3) if you look closely, there are tiny streaks of colour on the screen here and there. Doesn't bother me much, but if you're OCD, it might.
It takes about 24h for the bubbles to disappear - don't be tempted to squeeze them! you might actually deform the protector.
Overall, I'm pretty happy with it.