I've been there. A friend took me there a few months back. The owner was not a friendly guy. But he wasn't a mean guy, he just stood behind the counter looking unhappy.
They have a large warehouse, but don't use it well. They only have a few racks of dry goods. They have an entire room of just tanks for sale; complete setups with stands and canopies. I loved how they organized their corals. Each tank was for a specific type, Xenia tank, Mushroom tank, Sarcophyton tank, sponge tank, etc. They have a lot of fish however every one of their "fish only" tanks seemed to have a few dead fish in it.
The guy on the floor who assisted me was very helpful and I enjoyed the experience. He actually encouraged me not to get an anemone while i was there because none of them were healthy enough. Imagine that, a sales clerk working in the interest of the consumer! I bought my cleaner shrimp there and he is a healthy specimen.
In general, it's a great place for corals and tanks, not a great place for dry goods or fish necessarily. Their fish selection is huge, (but unhealthy). The owners aren't that talkative.
If you sign up for a membership you get cheaper prices. I'll probably never go there again, it's far away for me in South OC.
Josh