Like all the other reviews written here - it is seriously one of the best gelato places I've been.
The first time I had was the Tsing Tao Peach. What a combination! You can really distinctively taste the peach mix with the Tsing Tao (which is a Chinese beer btw). It's sweet, refreshing (perfect for the summer) and you can a little tipsy from it.
Other flavors I recommend include the Green Tea Whisky, Makegolli, Viet Milk Tea, HK Style Milk Tea, Seasame (THE BEST!).
You can order 1 or 2 flavors. If it's your first time, definitely do more variety so you can know which ones you like. If you're with a few friends, get a wide variety and share!
They also provide sampling if you're not sure how it will taste like (very nice and friendly staff). You can also buy a tube home if you definitely know you want more of this delicious stuff!
Remember to collect and bring your stamp card!