So far I've traveled to/from the USA round trip once. Stopped at Shannon on the way home in the very early hours after an allnighter and the couple of hours there nearly killed me when, at that stage, all I wanted to do was get home, get washed and get some proper sleep.
I'm travelling to the US again later this year, this time with American Airlines Dublin to/from Chicago. Please, please, pleeeeze let there not be a stopover in Shannon, ideally in either direction.