Some people complain that the Gorilla glass isn't as tough as it's supposed to be. That it scratches or can be broken -- like putting it in your pocket with keys, or back pocket and then sitting on it. Others have general gripes, but always about the glass. Personally I have dropped my Defy several times on stone floors (my house) and once it slipped out of my hand, ricocheted in a corner of stone tile like a ping-pong ball then hit the stone floor. Another time I dropped it face-down on rocks and asphalt. Thus far, not even a scratch.
I have immersed it in beer and hot coffee with no issues. But... glass is glass and my son's iPhone is a whole block of Gorilla glass and his pals have broken theirs so he keeps it in a case.