I've had yum cha at East Ocean several times - for lunch a couple of times and late at night for supper several other times.
I like the variety and quality of food, and the service is usually pretty good.
My one gripe is that they don't push around carts for yum cha at lunch. Instead, you fill out an order sheet and the food gets delivered to your table. While this is understandable at night, it's really not necessary during the day.
At some stage they used to have carts going around, but they have stopped doing it. Boo - yum cha isn't yum cha when you don't get to peek into the carts of food and pick what you want.
The plus side is that it's a big restaurant so you're likely to get a table.
East Ocean - that is, if you can be bothered waiting around.