I'm a Yankee, so IRIS always saves me a decent amount of time. It's a shame the Global Entry system in the U.S. costs $100 to register...and you're not even guaranteed to be accepted after you've paid the fee! Not to mention the "interview" proceess. Much preffered the 5 minutes it took me to register for IRIS...it's about the only thing I have found to be MORE efficient here in the UK.