I went and it was a relatively short line today (around 10 mins, maybe 'cause it was chilly today), which is not typically the case I hear. I got the chiffon cake sundae swirl (match/vanilla ice cream) and the tsujiri sundae. It's pretty and great for pictures but tastes is mediocre personally.
It was ~$7.50 per sundae before tax, which I pretty pricy for ice cream, plus the line. I thought the cookie and rice ball on the tsujiri were bland. But the matcha flavour was strong thus pretty bitter, so if it's not your thing the vanilla mix makes it sweeter.
They only take cash, which is an inconvenience to me because I normally don't carry cash, so take note if you come. Seating is limited (3 tables of two, 1 for four), but it doesn't feel overly cramped if you do get a seat though. The line doesn't lead into the seating area which is nice.
I'd probably not come again because of the price, but cool place to check out of you like matcha and want to splurge a little.