Coming from one of the largest arab-american communities in the United States, Dearborn(Detroit) Michigan, and someone who has dated many middle-eastern girls in his life, I can honestly say I've learned my lebanese food as well as any native of the middle-east. I can tell you that Byblos is not up to par with most Lebanese restaurants I've been to.
I went last week with my girlfriend, and was shocked(yet impresed?) at the layout of the restaurant. It was much more high-class than I had imagined it would be. Not what I'm used to with Lebanese restaurants. It was a nice place, but I could already tell the food would not be authentic.
I ordered the stuffed lamb-breast, which was actually pretty good, but extremely overpriced. My girlfriend ordered a kebab with rice, which was rather dissapointing. I've definetley had better at most middle-eastern restaurants I've been to. It was rather dry and bland. It was also overpriced for what it came with, which was practically nothing except rice.
Maybe I'm not being fair to this place comparing it to the Lebanese cuisine of Dearborn Michigan, but I feel the food was sub-par, unauthentic, and not worth the price. Then again, it is Manhattan.
Pros: Nice environment, good staff
Cons: Overpriced, unauthentic, food could be a lot better