Ramen Isshin has been my local go-to ramen shop for the past 3 years. Now, they're open in the Assembly Hall and I cannot be happier. At their original location, you can expect lines out the door (especially during colder months) and although there are lines here too, they're not nearly as long.
The quality of ramen is the same from the original, just served in tossable bowls instead. Currently, the ramen that requires wok-fried toppings (spicy miso for example) aren't available yet, but I was assured that they will have it very soon so the menu isn't limited at all. The soup is still smooth and full-bodied, while the noodles are chewy.
Seating is in the Assembly Hall, which is super casual and plentiful as well. Overall, one of the best options for ramen in the area for an affordable price that's quick and easy.