Cheap and delicious. Most dishes come with a free side drink, and for $1 extra you can upgrade to a cold drink, like the "iceless HK style tea" which is served cold by keeping the cup in a little ice tray.
The curry dish is fantastic (about $8), and if you're feeling really really hungry (or if you're sharing with someone) you could order the curry submarine for about $9 (warning: lots of bread). The soups are great too, and you can pick your own toppings (around $6-7).
If you're on a diet, get the noodle soup with pork bone broth, no salt, the shiratake noodles (almost no carbs), bokchoy and mushrooms!
They have a membership card that costs 20$ and gets you 10% discount for life, and a $20 voucher for next time (so basically it pays for itself).