More information on it here
But WAIT! What's this?? Maybe we shouldn't set it just yet!
Sigh. For me, I say leave well enough alone for now. Keep the filter, let them update it in June (per the zdnet post link) as it is better than nothing on my Dad's computer.
Stay on top of these things but realize security should never be browser-specific. You will have users to your sites with all sorts of browsers...close your holes and be safe on the web. It is a wild world out there.