Regarding the dangers of pressure cooking with typical home units, it should be noted, perhaps, that that paragon of broasted chicken, good ol' KFC, was developed using a first-generation Presto pressure cooker in the 30s. As stated on the KFC website, "Then the Colonel went to a demonstration of a "new-fangled gizmo" called a pressure cooker sometime in the late 1930s. During the demonstration, green beans turned out tasty and done just right in only a few minutes. This set his mind to thinking. He wondered how it might work on chicken."
"He bought one of the pressure cookers and made a few adjustments. After a lot of experimenting with cooking time, pressure, shortening temperature and level, Eureka! He'd found a way to fry chicken quickly, under pressure, and come out with the best chicken he'd ever tasted."
There is even a picture of the original Presto cooker he used: http://www.kfc.com/about/pressure.htm
Note that this is not a recommendation to try it!
And, if you're ever in the Atlanta area and have a hankering for broasted chicken, try one of the Zesto's outlets (mentioned earlier in this thread in Columbia, SC). Very tasty!