Love Umi Sushi. Always fresh, always friendly.
I am by no stretch of the imagination a sushi connoisseur, but I know what tastes good and I know what tastes fresh, and that's what I get at Umi Sushi. Their presentation is always very nicely done as well.
I have ventured a little bit off the sushi menu as well, and have found their other offerings to be good too. The Yaki Udon Seafood Noodle, for example, is where I usually land if I'm not going all sushi/sashimi. I've also had their more "Americanized" dishes such as the General Tso Chicken, but I would recommend sticking to what they're good at; Sushi!
Finally, I would highly recommend their chocolate lava cake for dessert. I know, I know, it sounds crazy ordering dessert from a sushi joint, but this cake is to die for. I'm certain it's from a box or some other pre-prepared arrangement that's cooked up in the microwave, but it's delicious! And I wouldn't lie about chocolate cake!