I ordered mine on Monday minutes after Mr Mobile's YouTube review launch and they just showed up about an hour ago. So far I'm really digging them, wish I could have gotten orange ones but I wasn't willing to wait longer. My only experience so far with good Bluetooth headphones were my Jaybird Bluebuds X (2012) and my Surface Headphones. Compared to my old Jaybird's, the Pixel Buds are way more comfortable and sound better. Of course there is no comparison to my Surface Headphones sound quality, but that is not the purpose of Pixel Buds, they will never sound as good as over ear headphones.
I have yet to pair them to anything other than my Pixel 3 and I have only used them to listen to music so far with Google Play Music. I'm looking forward to trying them out with phone calls and video calls.