i actually had severe ghosting problems with my original blackwidow ultimate. not just while gaming, but while typing too. when typing too fast, keys wouldn't register, and sometimes it would randomly send the f12 signal.
The problem with the old Razer Blackwidow Ultimate was being a 2KRO keyboard with just a gaming matrix around the WASD keys, where more than 2 keys could be pressed. Some pretty retarded trick for fooling people, I guess.
Anyways, it seems that problem was solved on the Razer Blackwidow Stealth, where it really became 6KRO and now on the new version it's 10KRO (although it's certainly through driver, since USB doesn't accepts over 6KRO normally).
Though meh, if I had the money to buy a BWU, I'd rather spend on a Cooler Master Trigger without even looking back. They also have Cherry MX Brown (and Reds and Blacks if you look enough for them) and you don't need to worry about getting a faulty unit or about some crappy keycaps. Besides the better overall quality, it even has more features than the BWU does and its software doesn't sucks like Synapse 2.0 does.
But well, I can't deny the Blackwidow BF3 Edition is better looking than any other keyboard in the market, but... Seriously, the right way to buy a keyboard is not by
how good it looks, but rather,
how good it is. I myself find the IBM Model Ms ugly as ****, but you gotta respect them!