I have a bad habit of laying the phone in my lap while driving then getting out and the phone goes flying across the parking lot, this happened with the m8 and luckily there was only a scratch on the edge . The phone was laying face down with no case so I amazed the screen was not shattered.. Good thing it happened during an exchange period so I exchanged it with no problem
Dropped mine getting out of car at only 5 days old shattered the screen... , - had been procrastinating unable to decide which case. Luckily I was able to send it to HTC advantage and they replaced the screen. She is secure in an otterbox now..
My friend dropped it on hardwood floor when he was trying out my phone, it was unscathed because it was behind a Zagg glass screen protector and Spigen Slim Armor case.
So is the build quality good enough to survive drops without a case? The build quality is good and the drop test videos seem promising because one of them was able to run over an M8 with a truck and still have it working.