TL;DR: This location isn't as good as the one downtown. They food was alright at best, but I find the portions a bit small. The location is also pretty small, so expect a wait during peak hours. If you come during non-peak hours (say after 8:30PM), there usually isn't a line; even on weekends.
Food (3/5):
I was super excited when I heard that Sansotei opened a Markham location when this first opened. I have had this a total of 3 times, and every time, the food was mediocre. It was definitely on the more expensive foods around the area for the amount of food that you get. If you do come here, I would recommend you get the Tonkotsu because that is the one I enjoyed the most. Honestly, go to the downtown location or another ramen shop if you're really craving it. I would not recommend this place unless it is the only place that is opened or if you're really really craving ramen.
Service (4.5/5):
Despite their food being pricey and mediocre, I would say that their service is great. You can easily get their attention, and they always have a smile on their faces. They forgot about placing one of our orders once, and provided us with a 25% discount on the entire bill after we told them to place it again (not many places in Markham / Richmond hill would do that. They usually just say you can cancel it and apologize).
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Overall (3 - 3.5/5)