Judging by the constant lines and Japanese clientele, this place is legit. And because it's seemingly authentic, vegetarian ramen is a mere fantasy here. All ramen options are pork-based. While not a place for vegetarians, Monta is a great spot for a hangover cure after too much partying. The consensus from my carniovore/omnivore buddies was that the broths were tasty but a tad too salty towards the end. One friend observed a person eating rice on the side with his/her ramen, perhaps a good solution to the saltiness.
Because I didn't have a non-meat option for soup, I got two bowls of the mentaiko on rice instead. Mentaiko atop rice is nowhere near as tasty as the noodle version. Also, butter seemed to missing from the fish egg mixture. I probably won't order this again if I return. The vegetable gyozas are probably worth trying, though.
Service is pretty good for such a fast-paced dining environment; the staff really know how to manage lines and to keep things moving along without being rude or giving you the impression that you were being kicked out. I'd definitely recommend this to any person looking for a soothing soup after a night of endless drinks.