I am a regular at Mambo, and am never disappointed. The fish is always fresh, and the taste and quality are consistent. They have an extensive menu of both hot and cold dishes, including many interesting appetizers-- I particularly enjoy the pan-fried gyoza and anything tempura, as it has always been light and crispy. One criticism-- the hot food is sometimes scalding hot, causing me to suspect that they are using a microwave to heat it up (this was the case with beef negimaki, for example, which remained inedible for close to ten minutes, and then it was delicious). However, I overlook this issue because I really go there for the sushi, comfortable surroundings, friendly staff, and reasonable prices. And their $1 sake/beer deal on weeknights is pretty great, too.
Pros: fresh fish, polite and friendly, good deal
Cons: hot not made to order