Good Japanese cheesecake, but I wouldn't wait in a long line for it. There are other places in the GTA where you can get Japanese cheesecake too. However, Uncle Tetsu's was very fluffy and enjoyable - fluffier than the cheesecake I had in Japan actually if I remember correctly. I've been to Uncle Tetsu's twice now - once in the afternoon and once at around 7:30pm both on weekdays, and there was no line either time.
For those of you who've only had western style cheesecakes in the past, I also think you need to go in with the expectation that it is NOT a "cheesecake." The flavour and texture are very different and if you go in expecting a "cheesecake", you will be disappointed. It is still a very enjoyable cake, but much fluffier and less sweet.