Figured I would weigh in here with a few observations / anecdotes on assorted points in this thread....
I have carried Sig Sauer, Glock, Smith & Wesson, and Kimber semi autos in one capacity or another for going on 17 years now. Never bothered to cycle the magazine springs and the guns have always functioned fine. Of course, they do get unloaded the fun way on a fairly regular basis, and I recognize that bad mags can really ruin someone's day when Mr Murphy pays a visit. If you do question the condition and quality of your mags, then invest the money to replace them...... as a related aside, I did have a Sig P228 spring fail in my gun during one qualification course. Round 7 went down range and the gun died, becoming a paperweight. Then last year I shot over 2K rounds through my Glock 22 during a week's course and afterwards the armorer did a complete tear down discovering several connector pins broken completely in half. The gun never gave any indication of a problem and ran flawlessly. I do love that piece.
.......
I used to keep a "cold" gun next to my bed, nothing in the tube but a full magazine in it. I figured that was a pretty safe way to keep the gun. Then one morning I woke to find I had field stripped the gun and it was sitting in 5 pieces on my bedstand, all done in my sleep. That scared me silly. Now I keep a shotgun nearby in a place I have to be awake to get to. SO, while I think it is essential to have some kind of defensive weapon ready to repel any miscreants, make sure you will be awake when getting it.
.........
Dogs are fabulous deterrents, but criminals can be dumb as a box of hammers. About 8 years ago I was awakened about 0200 by my GSD Ranger barking. Really, thinking nothing of it, I told him to be quiet and went back to sleep. I got up a few hours later for work only to find the screen missing from my kitchen window, which thankfully was locked. No entry was gained, but that kitchen window was next to Ranger's outdoor kennel with a 12" x 18" sign that reads Warning Police K9! Thankfully the CSI tech was able to match a print from the screen (found next door) to a known criminal. He actually tried 7 houses on my street that night, successfully entering 3 with open, unlocked windows, and stealing purses and wallets. The fingerprint from my house helped convict him and send him to jail. My lament - if only I had woken up and listened to my dog! Chasing a burglar with a Police K9 is great fun.
...........
I live in a nice neighborhood and have a marked police vehicle in my driveway, and still someone tried to get in. So, for those of you who still keep your doors and windows unlocked....think again. Seriously. Your safety and security depends upon it. Also, keep your cars locked unless you dont mind contributing your loose change/GPS/stereo to your local crack heads. It always amazes me the incredibly high number of people who still dont secure their cars.....not smart.
................
For those that think they would feel guilty over killing someone in self defense and wont prepare to defend themselves with lethal force, well, that would have to be a "to each their own" view. I certainly dont feel that way, but oh well.
If you do choose to arm yourself, then make certain you have a plan on how to deal with such a situation in your home, and practice, practice, practice. Chance favors the prepared mind - truer words have never been spoken.