Pixel is a great phone. So is iPhone. If it weren't for OnePlus, I would use Pixel or iPhone. I really don't want to use Samsung, LG, Sony or any other phone maker out there. If any phone comes out with facebook/instagram/tweeter preinstalled, I don't want that bloatware on my phone.
But OP is clean, really, really fast, and has great design. All of that for the half of cost of Pixel/iPhone.
Now really isn't iPhone/Pixel competitor. It's a great camera (my own pictures are on this page), but even I as a complete photo newb can tell the difference in night photos.
But everything else is better then on Pixel, at least to me. OOS is simply fantastic.
And with all of that said, if someone from XDA finds another thing from OP and spying on their customers, OP will be dead to me. I hate that sort of things, no matter how anonymous that spying is, I really hate it.
But to anyone considering OP6, give it a try. You really won't regret it, but even if you do, you can simply return it.