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Tools need care too. One drop ruined my last "tool" (3GS) and that tool no longer had a working vibrate switch, as well as a cracked screen. Only took one time for someone to bump it out of my hands and fall on the sidewalk.
Not saying that this situation will happen to everyone, just that I don't want to take the risk. It doesn't take much to do a good bit of damage to these phones. I actually wish I had it in me to go caseless, like I used to. Oh well.