Couldn't believe there wasn't a thread already, but alas...
I finally braved a little line for Black Seed today. Last weekend, the line was down the block both days, but today when I walked by around 9:30, it was about ~10 people, so I gave it a shot.
The bagels are $1.50 each and off the top of my head, there's poppy, everything, salt, sesame, and plain. Maybe one more I can't remember. They were sold out of poppy and everything by the time I got there.
In addition to the requisite schmears, they also have 10 bagel sandwiches.
I ordered one with lox and dill spread, radish and sprouts ($7) on a plain bagel -- it was delicious! I don't consider myself a bagel snob or connoisseur, but this was noticeably different from any other bagel I've had in NYC. I would say it was a perfect hybrid between an NYC bagel and a Saint-Viateur Montreal bagel. It wasn't massive or doughy, but a little crispy on the outside and even a little blackening from the wood-fired oven. The spread was a little light on the lox, but that was made up for by the deliciously thin slides of watermelon radish and the fresh sprouts. For $7, it was well worth it. I might be back tomorrow to try the sandwich with the horseradish and the beet-smoked lox ($12).