I love Guster!
They are very, very chill, and definitely can put you to sleep..
I think they are unique, and I love their sound.
I haven't been to one of their concerts, but I've heard from friends they were great in concert. Then again, people seem to say that about every concert they go to..
Guster is a fun band, and it's hard for me to put a finger on why I enjoy them. I just do, and I think they are definitely unique, and have a wide range of songs, that cover various emotions.