I've made lots of brackets and mounts that are still in use 3 years later. If you use a heavy fill pattern (75% for me) they can be quite solid and durable. Of course as a prototyper it has been very valuable too, I use a light fill, 25% just to test fit a project.
I have a big thread here if it's allowed to link.
Hoss's 3D Printers
Hoss