I read that the edges were sharp and you'd need to file them down before putting them in your collar...I decided at $6 I could live with that...

Turns out they weren't at all. No need to file down the edges, they were fine. It's not that I'm unconcerned about it either; I made sure I wasn't going to ruin the collar of my Neiman Marcus dress shirts before using them.

I see people using neodymium magnets to keep your collar in place too...I wonder why that's even necessary. These are heavy and rigid enough to keep your collar looking great weather it's a spread or point collar. I wear a 17-17.5 neck size shirt, so maybe for bigger or smaller guys it's a problem? I don't know...I also can't see that helping with making the apex of the collar look any better if you don't bother to iron your shirts or have them cleaned professionally.
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EDIT AFTER TWO MONTHS OF USE...

My Fiancee wanted me to add to this review. She said that this is the single most impressive product for the least amount of cost that has every been created by humankind. For <$7 - she now doesn't have to check all of my shirts for collar stays, and can now safely throw them straight into the laundry due to the fact that I now remove the collar stays before throwing them in the laundry. She loves these "fancy" collar stays so much in fact, that she's going to buy more for her friends.

She went on to explain how much time it actually saves her...

Suppose she does the laundry once a week, and there are 5-6 dress shirts in the laundry every time she does laundry. Each dress shirt takes approximately 6-10 seconds to find the collar stays, and remove then. She then has to spend another 30 seconds transporting the pile of collar stays up to the bedroom. That's nearly 1 minute and 30 seconds saved EVERY WEEK. That's nearly and hour of her life back over the course of a year!

If you really want to get technical...Suppose that it takes 0 (zero) extra seconds to wash a dress shirt with these new collar stays, since I remove them before throwing the shirt into the laundry...and absent these metal collar stays, it takes any amount of time greater than 0 seconds to remove the old plastic collar stays before laundering the shirt....well then...that leads us to conclude A STAGGERING INFINITY PERCENT INCREASE IN THE EXTRA TIME IT TAKES TO LAUNDER A SHIRT WITH OLD PLASTIC COLLAR STAYS VS NEW METAL ONES.