I was sadly disappointed by Sushi Den's a la cart menu and service when I went with a party of 7 (plus 2 toddlers).
The service was very friendly but not very good. To start, our server only took half of our table's order then left. When we finally realized that she wasn't coming back we had to ask someone else to take our order. I ordered some nigiri sushi, a spicy red dragon roll, and seafood udon. The server told me that my roll didn't come in spicy and I had to show her the menu where it explicitly states that dragon rolls can be made spicy.
When the food arrived, I got a spicy green dragon roll and sent it back because I wanted a spicy red dragon roll. I got a non-spicy red dragon roll. I also received a fried seafood udon instead of the soup. The server took that back too and came back with the soup. I will say that the server was quite pleasant throughout this whole ordeal.
The food itself was good, not great. The nigiri had too much rice and the fish wasn't as fresh as I had hoped. The dragon roll (aside from not being spicy like I ordered) was tasty but the udon surprisingly didn't have too many noodles. Overall, I guess I can't complain too much since it is an AYCE restaurant, so the quality was that of an average AYCE restaurant.
I've been here for AYCE as well and haven't been impressed. I feel that Sushi Den is pretty average overall although the staff is very friendly.