Oh and also, if you have iTunes (who doesn't?) go to iTunes U or type in 'merton college choir'. they upload evensongs there so you can gauge their standard- so far the music hasn't been bad in selection (Howells Coll Reg, Byrd 2nd, When David Heard) but I'm not sure I like their sound...bit uneven.
But yes, make your own mind up. What with Peter Phillips directing (he did the Tallis Scholars) they could be seriously good in a couple of years.