They seemed like a good idea so ordered a couple different sets, both from Amazon and both from Hobbbysomething. One set clips on nicely and seems relatively secure while the other set is absolutely not and won't even clip on correctly. Ok, that aside, what do you guys think of using these? I'm aware they're only good for a certain class of conditions and that's ok. I assume they're a little extra insurance. What do you guys think, especially if you've used them before. They were cheap enough, sorta. Thanks.