I wouldn't go totally out of your way to order from Hong Kong Chop Suey, but for carry-out it's your typical solid Cantonese fare. Nothing special, except they do give a very fair amount of shrimp in their shrimp chop suey. Prices are reasonable as well.
A little better choice in Mundelein is China Court, on Rte. #176 just west of Midlothian next to the Dominick's. A tad pricier, but very good sesame chicken and hot & sour soup.