gb, it is really good!
i've been trying to duplicate the sauce, and i think i've gotten close, with a brand (sorry, the label is in japanese) of fish sauce, and the addition of a little sweet rice vinegar. it is so good that i sip the stuff after the rest of the noodles, fish and veggies are gone.
oh, and there's a coupla lemon wedges too, to squeeze on top just before eating.