For those worried about a crash and not having a bumper support, think of the BIG picture. The bumper support is shaped like a U. It's NOT solid. It is fairly thick metal, but thin enough to cut using a sawzall without hassles. Then, you're putting a big ol FMIC, also made out of metal in it's place. It's not an "open hole", the FMIC is now residing there. In an accident, your FMIC is taking the hit, vs the U-shaped bumper support. The rigitiy isn't screwed either. In order to mount the FMIC, a metal bar has to be run along the front of the car, which is now tying the two front clip framerails together the same as the bumper support did. (Even without, there's the K-member, radiator supports, etc holding things in line. The car isn't going to fold in half!

)
And finally, the freakin foam in the bumper is what's really attenuating crash force. I've yet to see a FMIC that retains the bumper foam, unless it's drawing from under the car.
Just my $0.02.