We not knowingly went during their grand opening weekend and immediately saw a line up (this was around 10PM).
We decided we had nothing better to do so we waited about 20 minutes. Unfortunately they ran out of all the sundaes but we were still able to get their soft serve.
We tried the swirl (mix of black sesame and matcha) on a cone. The portions we received were very noticeable in size. The amount of soft serve given was definitely less versus the actual cone size.
In terms of taste, the sesame was very fragrant and flavourful which mostly over powered the matcha. Matcha had more of the bitter taste but we liked the sesame better.
Overall, the soft serve is good but wouldn't say it's worth the wait..We understand that they don't have control over the amount of customers that come, but I think Tendou can improve on their portions for the amount customers are paying ($5.50/cone) .
Worth the try but it's probably best to visit another time when there's no line up!