Overrated and overpriced.
$6 on average for a Vietnamese sub, and then some. These are usually $1-$2 elsewhere, notably at Chinese supermarkets or Vietnamese supermarkets.
What they have going for them are the kimchi fries that should only be consumed fresh and on the spot and the freshness of the sub as well as the hot meats/vegies in the sub. But, if you were to venture to say, Nguyen Huong Bakery over by Spadina, you can get the same thing for about $2 with your own oven at home!
I get it - this places fills a niche with the uninitiated and non-Asian crowd but for the initiated folks, we know where to go for cheaper Vietnamese subs that more or less tastes the same.
Banh Mi Boys is worth trying at least once though to see what the hype is all about.