The thinking behind it is that it helps restore hearing you've lost, just like a regular hearing aid, but because this one is hidden, it's less intrusive and is worn at night. They market it as the "contact lens for the ear".
What's unclear to me is whether they expect the end user to be able to remove it and put it back in again on their own.
If only audiologists/docs can do that, then I'm concerned about having something stuck very near my ear drum that I can't access. What if it itches, gets infected, malfunctions (say after it gets watered), blocks wax...
On the other hand, if I have the ability to take it out and put it in, I'm not sure I'll have the right dexterity to place it in the right spot and not damage my ear drum.
Of course occlusion effect and canal irritation are always an issue too, not unlike all the other RIC-types.