You’re likely to have to wait on weekends so try coming on the weekday when it isn't too busy, otherwise you'll have to wait in a pretty long line. The line does go by pretty quick though because they're basically just packing the donuts in a box.
I tried the macha, Halloween special, and cookies & cream. My favorite of the three was by far the cookies & cream. The Mochi gives the donut a chewy texture and the glaze is nice and sweet.
It's definitely worth a try, but I think it's just a boom that will finally end...