Out of the All-You-Can-Eat buffets in LaSalle, the Mandarin is the best one.
They serve their food fresh for both the noon and evening buffets. After the noon buffet is finished, any leftovers get thrown out, unlike some buffets than just reheat them and serve them in the evening buffet (cough Fu Lam cough). The food tastes better, too (sorry Vichy).
You'll have a nice selection of Chinese and American-style cuisine, with staples like dumplings, egg rolls, General Tao chicken and of course pork, beef and lamb. You might like the desserts with tarts, jello and ice cream to choose from.
It's a bit pricey, especially in the evening and on weekends, so if you want to save, try to make it between noon and about 3:00PM for the noon buffet.