I have a good blind spot monitor too: It's called setting your side mirrors properly.
Pretty much everyone uses their side mirrors as rear view mirrors - if you can see the side of your car in your side mirror it isn't set right.
My mirrors (on both my car and my truck) are set so that when a vehicle leaves my rear view mirror it is in my side mirror, and when I can't see it in my side mirror, the car is directly next to me. Neat, huh?
Also: If I had a car binging at me with some sort of notification, I'd look down at the dash to see what it was, and I suspect that won't help my odds in avoiding a collision.