I have them on my RT and outside of having really bad packaging(screw from bag D, flat washer from bag H, and wave washer from bag A), they aren't all that bad. They looked to me like decent quality MilSpec hardware.
So far I haven't had any problems as most of them are into aluminum or steel, and every one is installed with copper anti-seize.
THe price isn't too bad considering some of the hard to find specialty fasteners ithe kit contains, but since then I have bought bulk packs of fasteners to replace things like case screws on the engines. Cheaper that way.