You aren't missing much. I barely ever use my Security helmet or Katana armor. Now if I could put a Katana on anything besides the Hayabusa I would use it all the time. But the Hayabusa just has some weird neck collar that I hate. And as awesome as the maps look, I'll be waiting for them to be free. Just don't have the funds to spare.
I love my Security helmet. I use it and the Security shoulders with the Scout body armor. And my main color is pink I used to use the Katana body armor too, but decided to change it a month after I got it. Just looked cheesy with the katana and any gun on my back clipping into each other. Plus it seemed like a lot of people in Matchmaking were singling me out. I would get trash talked pre-match, had people ignore someone else on my team and kill me first, and it seemed like I was getting tea bagged more so than usual. So I dropped it.
I hate to break it to you, but the Zombie playlist this weekend was unranked. ...no achievements. BTW, I've needed one (Overkill *grits teeth*) ...since, like... the middle of November.
Heck, I'm still looking for people to play the first set of downloadable maps with since I waited until they were free. I may cave and buy the new map pack as my wife will be out of town this weekend and I'll need something to do!