I've seen them and I thought they were great. Their album 'Undrentide' was, I also thought, overproduced and overhyped (Classic FM three times a day) but my interest in their music overcame my scepticism I'm glad to say.The sound they made on stage was excellent, the effects they manged with their voices (there were eleven when I saw them)impressive and the arrangements good. I enjoyed 'Now welcome somer' in the album - it was, if anything, better live - quite hypnotic. But there again, I like harmonies and realise it may not be everybody's cuppa'.
The other thiing that struck me was that they appeared to be enjoying themselves. I'm sure they're well paid and ought to look happy, but it certainly added to the atmosphere of the evening.
Go and see them if you get the chance - develop your eclectic taste buds!