Well I got Killer 2100. Owned it for about 6 months and it doesn't do sh*t! I switched back to my on-board adapter. Getting better latency and higher download speeds(don't know how's that possible, but it is)
Only thing what it does - when you are playing at higher latency, game feels a lot smoother. And it's the only pro for that card.
Anybody, who is planning to buy this card, don't. It's wasted money and it's useless.