Without a doubt this is one of the best Mexican places in Toronto, especially in this pricerange. I've been going regularly since they opened, and it really reminds me of the taquerias in California more than anything. Easily better than Burrito boyz, big fat burrito, etc.
They don't keep much of the meats prepared, which means that more often than not it's cooked to order. They offer 3 types of tortillas iirc and 4+ types of beans. The meat options are also plentiful, and vegetarian orders get pickled onions + jalapenos. The guacamole is worth adding as well, in my opinion.
The sauce bar is well stocked as well - there's tons of variety and the best part is they're all good.
The dessert section of a taqueria is usually pretty overlooked but I strongly recommend the dulche de leche cake and the dessert nachos if you're looking for a little extra. The horchata is definitely worth trying as well.