Has anyone heard this/them?
I think they're rather wonderful.
Imagine a Gypsy Folk version of Neutral Milk Hotel with LOTS of accordions, mandolins, glockenspiels, ukuleles and many other things, but no guitars and you're pretty much there.
I think that's about the best description I can give. You'd probably better be off having a listen to them rather than me. But anyway, I heartily endorse them and their album.
^ The best one
or just, y'know: http://hype.non-standard.net/search/Beirut/1/
And should you wish, you can read words about them by people who are good at describing things.