I always love hearing the "if you feel you need a manual safety, you're an idiot who shouldn't have a gun!" Especially when half the people saying it are 1911 zealots! The simple fact is, CRAP HAPPENS! You can not control everything, no matter how careful you are. One added extra safety feature can give you that extra sense of confidence so that you actually have the gun with you when you need it, rather than leaving it at home. Practice your ass off getting that safety off on the draw so it becomes natural (just like all you 1911 people do).
Here's a scenario. Man with an unknown heart condition and three kids, carrying a Glock because he loves his family enough to protect them, has a heart attack and falls to the floor, out of it. Oldest kid runs off to find help. Middle kid cries her eyes out. Little one...well little one sees daddy's toy hanging out of his Crossbreed and grabs it. BANG! Middle kid takes it right in her crying left eye!
Yes it's extreme but still possible. I'm not saying everyone should have the manual safety, not everyone needs one, not everyone has kids, pets, ignorant but helpful neighbors, etc... I'm just saying there is no reason to mock someone who feels more comfortable with that extra safety feature. I prefer it. I have a three year old that has already gone through Eddie Eagle and is pretty good about not touching my gun, he knows to not touch it, he knows to come get me. He has passed every test I've given him with training guns. But still... you never know. You just can't control every aspect of life all the time. It's not hard to flip that safety off when you draw. It doesn't add ANY time to the draw.
Also, I have both the SR9c and the Shield, the SR9c is hands down easier to shoot, has a higher capacity, has a hella-better trigger, but OH NO you have to ignore the LCI! AAAH! The trigger on the Shield sucks dino-dink, but yeah it's slim.