I've been to Roll On Sushi Diner more times than I care to admit. This restaurant is one of the coolest spots I eat at in Austin. The atmosphere is very cool: mix an old counter service diner style with a very modern, artistic flair. Great colors and I love the music. Be forewarned, this is not a quiet lunch/dinner spot. This is not somewhere you go to eat a traditional restaurant meal in a booth with a darkly lit, slow ambience. Roll On is more of a social, musical experience.
You can see the chefs at work behind the counter and they're creating an eclectic mix of foods displayed on their large menu above you. They serve a variety of traditional rolls and sashimi/nigiri specials, and they're incredible. Some of them step out slightly into a more fusion approach to traditional sushi, like a tuna roll with quacamole, jalapeno and spicy mayo. Then there's the ""Austin Fusion"" section of the menu, which steps wildly into an unforeseen territory of sushi rolls. They have a tomato caprese roll, a Caribbean shrimp roll, a chicken-fried steak roll, and a bbq beef roll, amongst others. It's all extremely good. My personal favorites on the menu (pretty much the ones I order every time now) are the California Crunch Roll, the Dy-No-Mite! Roll (this will own you), and the Barton Springs Salad. I also go for the Hippy Roll and the Respect My Asparagah! Roll which are vegetarian options. Vegans and vegetarians can eat well here, as well as those who are gluten free, like my wife (bring your own gluten free soy sauce).
I highly recommend this restaurant to everyone I meet. I even spoke about it with some random woman in a Walgreens buying ice cream the other night. I also bring folks with me from all over, and they've done the same. This is the kind of place that will be a great success in Austin for a long time.