I work on Bay Street and often go to Akco for lunch dates. The service is quick, efficient and friendly, and the sushi is consistently good. I always order the salmon and tuna maki, and have never had a bad piece of fish here. I like that they don't use too much rice in the rolls (not a fan of huge rolls that you can barely fit in your mouth), and that they have options for non-sushi eaters. I also highly recommend the gyoza- delicious!
I (along with the rest of my office) often get take-out from Akco for lunch. We've never had a bad experience, and it's usually a very quick turn-around.
My only warning is that it seems like the quality is better at lunch than dinner. I recently went for happy hour (30% off between 3-7pm) for the first time, and can understand why other reviewers may have been disappointed if that was their only experience with Akco. I'm not sure what it was, but some of the rolls were not in keeping with the quality that i've come to expect from them. For example, the fish was a bit too cold and the rice tasted like it had been in the fridge. It wasn't bad, but it wasn't great.
Overall, it's one of the better options in the financial district for sushi and I'll definitely be back.