It was good, amazing sound and sitting there listening with a sleep mask, completely blacked out was special. At moments, it really felt like an out of body experience. Only real gripe, and it's quite a biggie, what ever they were using for playback really needs looking at. I've got a FLAC version of ( ) on my network which my home bluray player will play without gaps. The Dolby Screening Rooms in the heart of London, with all their know how and expertise, haven't. There were noticeable gaps between each track, and at the volume they playback at and in such a hushed environment it was really jarring. Quite the mood breaker during the first side in particular.
That said, I'd highly recommend the experience, you hear stuff you haven't noticed, you feel like you're in the studio.....until those gaps.
And don't worry, as a Brit geek I made sure they knew, the bloke actually said he'd warn the people in the late listening.