As someone who's had many a bowl in Taiwan and has a mother who cooks some of the best homemade TBN, I've developed a great taste for beef noodles. This place is better than almost every place I've been to in Taiwan, including its own parent store.
The noodles consistently al dente (or Q for you Taiwanese out there) and the soup hasn't changed since the first time I've been there, unbelievably hearty and flavourful. If you're brave try the soup with a little bit of spice. Most TBN in Vancouver (see: Pearl Castle, Beefy Beef Noodle House) have a lighter broth that, arguably, is more authentically Taiwanese. The portion of beef they give is generous and each piece is all meat with no fat. Some people enjoy this, others enjoy the more tender but fattier chunks that "melt" in your mouth...to each their own.
I have to mention that I do not enjoy suan cai, or pickled vegetables, in my soup. A lot of non-Taiwanese people
don't like the taste as well, so make sure you ask for no pickled vegetables if it's your first time trying out TBN.
The small dishes are a rip off for its price (in Taiwan it would cost you maybe $1 for each, whereas here each plate - I believe - sets you back $3.50). I've tried the marinated tofu and cucumber dishes before and they taste very authentically Taiwanese. I would suggest you skip out on these though, simply due to the price.
The only thing keeping me from coming here more often is that it's quite out of the way for me. Any time I'm in Burnaby though I make sure I stop by.