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Quite agree KJ. My old P3A serves my purpose very nicely. Simple, safe prop attachment, as long as one tightens them proper like before flying, secure battery, love it.Not to sound like "I told ya so." or anything, but this whole discussion highlights ANOTHER reason why I still have my trusty little 3Adv when I could easily trot out and buy a 4xx.
1. Propellars are attached as though they are necessary. IE: Screwed on with self-tightening thread direction. You should see Mercruiser's method for attaching props
Lock ring, lock tab and Lock Nut
2. Battery does not fall out in mid-air. IE: Look at how your car's fuel tank is attached
3. If I really truly do need a picture of something, I will get up there somehow with my Nikon. So the 3's camera suffices for my needs
This thread certainly got a few temperatures up for some reason. Everyone is an individual so we all have our own ideas on what's right and wrong. Plastic props are almost impossible to check for internal cracks, and they can occurs, unless one has an ultrasound kit and even some micro external ones would be difficult to spot unless one has a DP crack detection kit (Dye Penetrant). Change props every year, personal choice. A more reliable thing to use would be number of flying hours. Don't know if DJI have a "recommended life" for their props? Have they tested some to destruction? maybe someone on here should do that

AS FlyDawg says, make sure you check the simple things every time!