The standard deal - you can choose your meat (pork, beef, chicken or mushroom) & also the noodles. They ran out of my favourite kuay tiao, but I chose glass noodles (the only other option for today, how sad) & it was still satisfying.
Tried the pork & beef options; both broths were flavourful & delicious. However, I preferred the beef one because the pork meat was too fatty, & I'm the kind of person who cuts away visible fats, so that was too troublesome for me, & I ended up with barely any meat. By default, this comes served with chilli flakes - adds a good kick yo it, so be sure to tell the waitstaff if you don't want them.
As with most (if not all) Thai boat noodle places, you can choose between a small $2 portion, & a big $5 portion. The big, imho, isn't that big. But it's decent.
Overall verdict? Pretty damn tasty. I might make this my regular joint every time I go to Mustafa.