In a nutshell, we were there and it was great. Hats off to iTunes to not packing the place out so it was uncomfortably full, it was just the right amount of people, and we had a great view. Having never been to the Roundhouse before, that was a treat in itself, such a nice venue, and with it being in Camden, it felt like the epitome of seeing a gig in London.
Vampire Weekend were on form, flawless vocals, bouncy guitar beats and a bassist who had some moooooves, you can watch it live by clicking on this link which takes you into your iTunes. If you look real close in the pic below you can do a Where's Wheeler and Warren :)