Chi's Congee House is a good place to go if you're ever graving for quality congee! Probably the only other place I know of in Mississauga that specializes in congee, they do offer a variety of other foods that I can recommend to try that you may not find in other restaurants necessarily (ie. their deep fried wontons are awesome!).
If there was a 3.5 rating, I would give it around so just because there are other Chinese restaurants around that can compete with this one. So all in all, I would say it depends on your cravings at the time.