+1 on this one. We've seen it on several occassions at the shop with the Aries grill guards. In addition to what TJ said, the "wings" or side guards flex to the point that, when impacted, they'll hit the fender and cause damage, then spring back into position.
Make the investment. Go with a real bumper.

Jeff!
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RNT Knives... Go where you want, Take what you need!

Original Registration, NOV '07
Pre-crash post count - 396

"...the Earth will continue turnning, even when justice dies." (Revy Two Hand, Black Lagoon)