Went to Mitsui for our company's annual dinner. Had a great meal of about 8 courses, largely based around various forms of seafood and sushi. The courses were thoughtfully timed so that diners didn't feel rushed and the food didn't come out cold or overcooked. The service did an excellent job of subtly pacing the meal. Standout dishes included steamed scallops, sashimi and a kobe beef dish with candied onions.
This restaurant would be a great place to take a date or clients. The atmosphere is urban chic, but the space is large and welcoming. The patient, attentive service is the best I have seen in Taiwan.