I use this everyday to make matcha. I make it hot and cold, and never fill past the line on the cup. The only time it exploded on me was when I mindlessly shook it and opened it while driving. The button works to relieve pressure to prevent this otherwise. I would absolutely recommend this for those who are on-the-go and want to whip up some matcha beforehand.
This is You :-D
So this thing exploded on you, and you still gave it 100?