i've done this. friend endoed on his Felt F1SL. The bike suffered little cosmetic damage but the friend thought his top tube might be cracked, based on how the bike landed. Everything looked fine, but we did the "tap test" with a quarter and there was a noticeable difference in sound at one spot on the top tube. Whereas surrounding areas rapped sharply, this one spot thudded lifelessly.
Frame got sent to Felt and, sure enough, there was a crack in that spot.
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"When you are chewing the bars at the business end of a 90 mile road race you really dont care what gear you have hanging from your bike so long as it works."
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