I just bought a Lumina 750, and the biggest problem for me is how the light mounts to the mounting bracket.

The mount has a slider rail for the light, and there is a plastic tab at the end with two teeth. The light has two holes where the teeth are supposed to click into to secure it so it doesn't go sliding back off the rails. Problem is, the tab has no spring under it, and my tab kind of droops down so the teeth never engage firmly. And this is after removing it ONCE for the initial charge.

I can imagine that even if it clicks in ok, a few dozen times of pressing down on the tab to release the light for charging, locking up, etc. puts pressure on the plastic and it will start drooping down on its own.

Great light, terrible bracket mount design. Needs some opposite force, like a spring, to keep the tab up and tight against the light.