Rejoice is across the road from where I work so I have been few times. The food has always been pretty good and reasonably priced.
I agree that the owners and staff could be a bit more friendly, but its not as though they are rude or anything. Maybe thats how things are in Chinese culture. Distant.
Last week I was there. I really enjoy their salmon sashimi which is also well priced. This time I tried the seared tuna. I dont know what the spice rub was that they used but that seared tuna was simply fantastic!!
Its a pity they are a bit far from where I stay, we would go there much more often.