Usually when a place advertises AYCE, they're usually either sacrificing quality or service. This is not the case at Umiya.
I went there last night and the service was fantastic. The server was at our table at regular intervals to check on us and was extremely knowledgeable about the menu. She also made suggestions based on our tastes that were spot on.
The menu is incredible. Appetizers, salads, soups, ramen and steak (yes, steak) were all available on the $26 AYCE menu as well as sushi and nigiri. The food is high quality, fresh, and the chefs were willing to tweak their rolls according to my very picky (I prefer selective) taste.
We were there kind of later (12am-1:30am--they close at 2am) but not once felt a rush to leave or pressure from the staff.
The Umiya experience was amazing and I'll definitely be back. This is probably my new favorite sushi joint.