Jon- unfortunately not as well as Halon. You can still buy the real thing both 1211 and 1311. It is being recycled, just like Freon R-12 is. It just costs considerably more than it used to.
I would only trust Halon myself- we are still using it exclusively on the jets, but we are also still using a lot of R12 too- so far we have been exempt in having to change it out.
Check with your local fire extinguishing gurus- they can hook you up with hand-helds, and can probably recharge/recertify an engine compt. auto setup for you as well. Maybe you can find one used or as a takeout from a damaged boat?