Are the fleet foxes a popular band?

i downloaded their song "helplessness blues" for free at fuse.com without realizing it, and when i was listening to my ipod it came on, and i was like "i really like this song". then, i noticed that they were coming to the tabernacle in atlanta in like a month, but they were already sold out. I've never heard of them and i listen to a lot of indie stuff, and i was surprised i had never heard of them before and that their tickets were already sold out (i sounded so much like a hipster douche there, but whatever) so yeah, are they a popular band? if you could compare their popularity to another band that would be nice. are they as popular as bright eyes or iron & wine, or a little more/less popular?