Disclaimer: I've only tried their takeout dishes, more specifically, the kare-kare and the Bicol express.
They're really good. Filipino food is few and far between in Mississauga, but those few Filipino restaurants make great food.
QQ doesn't have a detailed menu with prices, so don't hesitate to ask what they're selling for the day. My favourites are the kare-kare (oxtail, peanut sauce, shrimp paste) and the Bicol express (pork, coconut milk, shrimp paste).
They sell what looks like a small container of food for $8, but trust me, it's a STEAL. When you pour the contents over rice, it actually ends up being quite a sizeable meal, and can arguably even be split between two people. If you don't have rice, you can buy a bowlful for $2.
They also have a few Filipino snacks for sale, including polvoron, chicharon, and Speculoos peanut butters.