Pho Tau bay is ok, its broth is not stocky enough and lacks the aroma of a well made broth. The rice noodles used are too thin and somedays you might get the scrappy noodles (short broken strands.)
Not saying its bad but it will do if your hungry.
I stand by Pho An as 1 of the best in Sydney if not the best.Noodles are right,broth is stocky and aromatic.
Stay away from anywhere that serve a variety ie. Pho,Bun bo Hue, Rice etc. They are not specialised in pho or bun bo hue or any soup based noodles(these dishes have there own characteristics and it needs to be spot on and not half arsed) and often use the same base broth except they add a paste or flavoring to replicate either the taste of pho or bun bo hue.