I bought some C-41 kits from B&H a couple of years ago, and it wasn't even the brand they advertised on their web site. It said it was Tetenal, but what I actually received was Unicolor. That ticked me off to no end, and they didn't exactly handle my request for information very well either, when I wanted to find out what was going on.
I'd rather buy C-41 kits from the Film Photography Project or Freestyle, two online stores that have a tradition of supporting film photographers.