Chang's has gone a little downhill recently.  I have gone there for many years, and enjoyed it, but lately they have had a change of staff and the ladies with the carts are really pushing the food on you.  Literally putting it on the table as you are saying NO!  I have heard that the ladies are now on commission so, if true, that could be the reason.  Also, Chang's has raised their prices significantly.  To me, Orchid Gardens is a much better bet and they have a bigger selection of dim sum rotating throughout the restaurant most times.