I heard them on the radio a couple times (KBCO, I'm sure) and decided to look them up on YouTube the other day.
I think the appropriate word here is "awesome". Both in the sense of "wow, that's really cool" and in the sense of "sweet fancy Moses! How do they do that?!"
Tamacun - this is the song you're most likely to have heard on the radio.
For Diablo Rojo - this one features their unusual techniques a bit more prominently.
Capitan Casanova - but it's their live performances that are really great. This one has some rockin' violin accompaniment.
Vikingman (live) - and then there's this live performance at Glastonbury, which just blows me away. Near the end I started to wonder if something was actually going to catch fire.
kung_fu_monkey wondered how frequently Gabriella goes through guitars. I asked Google, but sadly, it didn't know.