Systems like these have been in use in at least one Middle Eastern unit for some time and are particularly useful in incident investigations.
They do require a great deal of responsible management in their use, but from my experience they have more often baled out an ATCO as described by AV8 than any other outcome.
I have to confess to once repeating something on the recordings outside a professional forum..... however it was a particularly good joke involving a petshop, a bunny rabbit and a python!!