I don't know which ones you've seen?
I've read numerous times people have had the standard props fail and snap mid air on the 450/550, don't know about the phantom, might be less likely as its lighter. If you buy upgraded props you'll notice a huge difference in strength and rigidity. I wouldn't risk my 550 with standard props now it has landing gear, gimbal etc, but its much bigger and heavier.
I've balanced props but not noticed much difference, but I'm not a pro flyer! Can't hurt if you've got the time to do it!
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