The two I posted have better capability to resist unthreading, as they're physically locked in. The construction is more sound than a piece of wire stuffed in the hole. Everything has it's proper application, helicoils are fine for some things, but I'd rather go a step further and not worry about it.

Then again, rather than sert-ing my sportster cases I'm cutting out one side of the thread boss, welding it back up and re-drilling/tapping (eventually).