I rate this place not only for the food, but the feel is exactly what I hoped/imagined a North American diner experience would be like.
The big breakfast (called "Beauty's 2" on the menu - I'm not sure what happened to #1) is great, and highly recommended. The bagels are as good as you'd expect for a Jewish-run restaurant in Montreal - flawless.
The pancakes are top notch, but I particularly like the normal ones best (rather than the blueberries ones). There's probably nothing wrong with the blueberry pancakes, but they just didn't live up to my (admittedly high) expectations. I consider myself a Blueberry Expert, and I haven't found a food that can't be improved by stuffing it with blueberries. Unfortunately, these ones just didn't make it. Stick to the plain ones.
Even with all these good things, the stand-out on the menu for me is their cookies-and-creme smoothie. Oh. My. G-d. It is amazing. I'm lucky Beauty's is on the other side of the mont from my home, or I would have gorged myself on it way too many times already.
TLDR; Go and try the cookies-and-creme smoothie. Everything else is good, but not as good as the smoothie.