None of our catches have broken yet, but we put bolts on the outside sliding doors/windows and cut wooden poles to put between the inside sliding door/window and the frame/bolt and this, we thiink, is prettty effective!! These catches really aren't secure!
We have been burgled, here in Dubai, by people who were easilly able to "crow bar" this sort of sliding door! We have wooden poles placed in all our sliding windows/doors here in Dubai now, as well!
Even though there is security at DV, there have also been burglaries there so best to install your own secure fittings, as you think fit!