My gf and I tried Yummy Pho after we bought a $10 for $20 worth of food deal from one of the group deal websites. It turns out to be the worst Vietnamese cuisine experiences we've ever had by far. So many things went wrong. Wrong kind of pork was used in pho. Wrong kind of flour was used to make spring rolls. The food was expensive compared to other Vietnamese restaurants in Markham. Even though we got the $10 for $20 deal, we ended up paying about the same price as what we would have paid at, say, Pho 88, except that the food at Pho 88 (or any other Vietnamese restaurants in Markham) would be so much better.
On a positive note, the service was nice. The owner just needs to replace the Chinese chef with someone who actually knows how to cook Vietnamese food. Come here if you think you may enjoy a Hong Kong version of Vietnamese food. But if you're looking for Vietnamese food (i.e. what Vietnamese food should be), you will NOT get it here. The food here is hardly qualified as Vietnamese food!