Whether you eat it straight from the oven or want to stick it in your fridge to cool it down and make it denser, Uncle Tetsu cheesecake is definitely worth a try. Probably the biggest misconception that people have is about the cheesecake itself so when I hear people saying Uncle Tetsu cheesecake isn't "normal" cheesecake as if it's a bad thing, I just shake my head and laugh. Japanese cheesecake is much lighter and "fluffier" than traditional New York cheesecake. When compared to cheesecake from T&T or other Asian supermarkets, Uncle Tetsu blows them all away. The taste is more intricate and way better than bland supermarket cakes.
You can also grab some madeleines while you're there, but I found these to be a bit hard and sometimes tastes stale. I always skip them. The store also sells cheesecake rusks, which are sort of like small, square cookies. These tend to sell out in the later parts of the day, so definitely go early if you want to grab some.
Overall, there's a reason why the line-up at Uncle Tetsu can get so long. The cheesecakes are fantastic. If you're not a fan of long lines, try going earlier in the morning when there aren't a lot of people.