First visit, I ordered the regular shio ramen, and my friend the spicy miso ramen. Mine was pretty good, but I honestly liked the spicy ramen better, since I like the kick to it.
Second visit, I ordered the spicy killer ramen out of curiosity. I have very high tolerance for spicy food, and this gave me a nice challenge. I finally finished all the noodles with like 5 cups of water, but the leftover soup was too good to go to waste, so I took it home and ate it with rice. It was that good.
I really wish that they have something in between the killer and regular spicy ramen though, the middle would give the best flavor.
I would definitely come back when I get a chance to.