I've used these on several planes. GreatPlanes includes them in several of thier kits. I built my first EXTRA300, and used these hinges just as instructed. The plane met an unfortunate demise, and the only thing left intact was...you guessed it....the hinge-lines. I inspected the wreckage thoroughly, and not one of these hinges let loose. That's right, totalled airplane, and the only thing surviving was hinges, and several splinters of wood.
These hinges are very strong if installed properly. I've since built another EXTRA, and did'nt hesitate to use the hinges again. They are very simple to install, to simple for some I guess.
Good luck.