An old friend of mine really got me into them. They don't have that kind of "fast" feel that many death-core and metal-core bands have, but they still are pretty great. This is the song that got me into them. If you like this, check out their Ashes to Ashes album, it's got this kind of vibe to it. If you want something more brutal - like with an Ingested feel, go look at their Self Titled EP and older albums.
I really like Chelsea Grin. I had the privilege of seeing them play along Carnifex and a couple other bands this year in Columbus. They were absolutely great on stage.