Well, you can't flip the blade open, so you've got that going for you.
I googled it to make sure I remembered what you were talking about, and found this decscription, which is not helpful:
"Cold Steel Super Edge Dagger"
"It's so light and comfortable to carry you'll never notice it when it's casually looped around your neck, conveniently laced to your shoe or cunningly pinned inside the crown of your hat."
Knife laws in NY are fairly subjective. I don't have a firm answer for you, but one judge recently noted at a sentencing that the fact that a knife was serrated suggested to him it was carried for evil purposes.
I think if you truly need a tough little knife for the kind of work that you do, it's probably a very good choice and your decision is probably reasonable and sound.
If you are just looking for a general purpose pocket knife in NYC, I personally would reccommend a swiss army knife.