He's hysterically funny - in Europe everyone seems to know Jon Stewart and The Daily Show, but for some reason not Colbert - so this is my 'plug' for his show.
(If anyone has ever seen me giggling hysterically at my iPad, it's probably his fault.)
Also, Colbert's a great Latin lover (see video below). Obviously, ideally we'd convince him that the Greek way is better ... but nobody's perfect.
The multi-pass is £10.99 and available here.
I also recommend getting a pass for The Daily Show with Jon Stewart (and as soon as the new John Oliver show is on iTunes I will get one too ...)