that style of quick release clip aren't necessarily bad, and they have an extremely high tensile strength compared to weight, and (depending on construction quality) a very secure lock.
That being said, they aren't on my camera gear, but I use them quite a bit on my kayaking and climbing/hiking saftey gear and they have yet to fail under load.
I suppose like anything though - quality of the part construction and how positive they lock into place will contribute greatly to how well they stand up in use. My pack uses them exclusively to make all the connections. I've regularly loaded it with 250# and the only thing holding the straps together was that style of buckle.
IMHO - if they clip and lock securely they should not fail you in real use. but then again like so many things if you don't trust your gear - you will generate lots of problems you really don't need.
perhaps a simple test - put the strap on something solid, with a similar weight as your gear. put yourself in a couple trouble positions and test the buckle. bump it, shake it, make it work. if it holds then you can breathe easy. if it fails - then you have your answer and it's time to look for another option.