I got shot in the eye by an airsoft pistol once, a springloaded one. If it hadn't been spring loaded, I'd be an eye short, methinks. I was blind in that eye for three days: everything looked like a mass of gray with sploches of darker gray where things were shadows or dark colors.
All in all, though, airsoft is pretty cool stuff. The realistic weight of many airsoft "guns" is nice for urban gaming. Of course, I live on a military housing installation, so airsoft isn't exactly...smart.