I've had lunch take-out here on several occasions and I've been pleased each time. There typically aren't a lot of customers in the restaurant around mid-day so the service is always fast and the employees have been helpful and pleasant. I've never felt rushed or treated with anything but respect by the staff. The quality is great for the price you pay. The food is always hot and you get a a very generous sized portion. For around $6 you can get a lunch special that also comes with a heaping portion of pork fried rice and your choice of either a soup or a soda.
Regarding Adria R's post, it seems her experience was a definite outlier. I'm not sure who expects a Chinese restaurant to have excellent chicken nuggets, fries, and donuts. If you stick to what they specialize in (Chinese food) I'm sure you'll be more than satisfied. Additionally, on their website they clearly state that delivery orders can take around 45 minutes to be delivered.
All in all Grace Garden is in my opinion the best Chinese food in the area and is definitely worth a try.