While Chang's might not be THE best Dim Sum I've ever had, Chang's is a great Dim Sum place for what Vegas offers.
Almost always, this place is packed (at least during the weekends so anticipate waiting for a table), parking can be somewhat of a b*tch and I leave pretty satisfied with my selection of their dim sum items.
Service here is pretty typical of a Dim Sum restaurant. I wish they would come back to my table more frequently to fill me up with my favorite seafood and dessert dishes. So, because I have to wait for specific carts, I usually stay here longer than I would like to fill up on the items I adore. Portions and actual pieces of dim sum are slightly smaller than other dim sum restaurants, quality of their items are comparable and prices are definitely affordable. I like that they offer hot chrysanthemum tea here.
In sum, I'm glad Chang's exists in the valley, otherwise I'd probably suffer from dim sum withdrawals.