My favorite place to get ramen. I always get the spicy miso; how hot it is seems to vary but it's always bearable. If you're really hungry you may want to add extra chashu or get a large. Some bowls come with more meat than others so it does depend on what you order.
They can get very crowded and it's small inside so I wouldn't recommend going during busy hours. For lunch, arriving around 2 pm seems to work fine.
I wouldn't recommend taking home leftovers unless you plan to eat it near immediately. I've taken home leftovers twice now and when I ate it the next day, not only did the broth separate (which looked disgusting), it also tasted weird.