we went there for the first time like two weeks ago(the one in Independence). Didnt do the challenge but the food there is amazing! I ended up getting fish and puppies.
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The sandwiches there are nothing shy of amazing, though their slaw is tasteless and their chili is meat-free (which is unconscionable in my eyes), but well worth a stop if you're in the vicinity.
A friend of mine has one of those discount tattoos, but he has a bunch of other tats so it's not like, "Oh my god, look at the grilled cheese tattoo on that weirdo."
EDIT: I've been on a corned beef kick since St. Patty's Day!