Nice clean look with amazing protection. Can't imagine using the phone without this case. It protected my phone from many drops.
Seconding Diztronic, the only cases that have actually protected my N6s (now on my 4th) from drops onto concrete.
Edit : I use the Ultra case version, slightly more cushion/bumper around the edges.
Diztronic Ultra TPU Case for Motorola Nexus 6 - (Full Matte Black) https://www.amazon.com/dp/B00QVO0D4W/ref=cm_sw_r_other_awd_3VOiwb56P04MK
While it may not seem like the most robust case, I cannot praise these simple cases enough. The corners have extra little bumpers and absorb a lot of contact. Couple it with a tempered glass screen protector and I have what I consider a damn tough phone.
My anecdotal evidence does not stem from the Nexus 6, but from the Nexus 4. I was bombing down a hill on my bike going about 35mph and hit a small bump that sent my N4 out of my jersey pocket. When I went to go retrieve it, not a scratch in site. The simple TPU case took all of the impact and left the glass front and back in pristine condition.
Fast forward to earlier this year when I had Nexus 6 in a slim case Spider and it being dropped from waist height onto a tile floor. The whole screen developed tiny spider cracks which branched out and eventually caused the digitizer to stop operating properly. Now I i have it in the Diztronic case and a YooTech tempered glass screen protector and feel pretty safe.