The clips are a little delicate, though forcing you to be careful in opening and locking them certain manual flight settings disable the excellent autel evo2 obstacle avoidance system Music when you are flying with the obstacle avoidance, disabled or with greatly reduced effectiveness. Having these on your evo2 airframe will provide some protection by helping you avoid damaging your propellers in flight, which could result in a catastrophic crash. I don’t know how much force they will withstand, but they appear to be capable of withstanding minor collisions, which is all i am worried about, works as directed and arrived on time. The guards are pretty good, but they could be better. They do not protect the front middle or back middle; they also do not protect the props from the top at all. Ayant dit cela, i understand that they are playing a balancing game between prop protection and weight and performance issues anyway.