[SAR]

The biggest thing is that the Glock plates rely solely on two tiny screws and a total of about 6 threads to hold the optic to the gun. If you look at something like the C&H plates, as an example, they are bridged in front of and behind the optic to hold it more firmly with metal to metal contact between the optic and the slide. Additionally, C&H uses a "T plate" to fasten the optic to the plate and separate screws to fasten the plate to the slide giving the whole thing a little more meat. That said, I haven't been impressed with the screws C&H has been providing. They are a bit soft and strip quite easily. But that is easily solved by using other choices.
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I had a huge problem with C&H screws. The supplied set broke when I applied the proper torque. They sent out two sets of replacements and they too sheared right off when the proper torque was supplied. The situation escalated to the point where the owner of C&H called me personally to determine if somehow I was over-torquing the screws. We discussed exactly what I had done and what had happened. He then personally pulled a few samples from his stock and to his dismay, those broke when he applied the slightest amount of torque. He investigated and found out that the entire batch of screws was never heat treated. He called me back and apologized profusely. The following week, I received a whole new C&H plate and a bunch of screws which he assured me had been properly heat treated. I installed the screws, torqued them down and have not had any issues since. A bit disappointed that this happened, but I was happy with the owner personally working with me to fix the problem.