I went on a Tuesday afternoon and they were pretty empty. With my friend, we only waited for our desserts less than 5 minutes. It wasn't until I read on Yelp afterwards I found out this place gets crazy packed on weekends and in the evenings.
Side note: they can do take-out, just let them know when you order. Basically they separate the ice and put it in a plastic bag. You just have to get home quick or else the ice will start to melt.
Important: when you go there, bring cash! It's cash only establishment!
According to their website, they'll be opening several other locations soon -- one being in downtown at the Park Shops. Why there and not Midtown or Washington is beyond me. But, woohoo I don't have to drive all the way to Chinatown to get my fix!
Bambu Desserts & Drinks
10613 Bellaire Blvd, Unit 150