Hiro's is a real find - an unpretentious restaurant with an intimate feel and really good sushi. It's also surprisingly inexpensive (though sushi costs can add up fast). There is often a substantial wait - I had a 15-minute wait at 8:30 on a weeknight, attesting to it's popularity with those in-the-know. They have several sushi chefs working simultaneously, and the nigiri and maki start arriving quickly. My favorite was the unagi, with the maguro and some of the specialty rolls not far behind. In addition to maki, nigiri and sashimi, the also have other Japanese food available, such as tempura.
This is a real sushi place of the quality you'd find in San Francisco or Seattle, though they make the concession to the local market of calling things by their English names (i.e. Tuna rather than maguro). The restaurant is a small business (family run?), and it shows - the staff know each other well and have been working together for a long time. It's a great little place, and I recommend it.