I was actually just talking with MorningSong in the chat about NMB "space invader" switches today. I've always found them to be a very fun switch, but rather impractical because once disassembled, the odds are that the switch mechanism will get bend beyond repair.
If the one you get does have space invaders, DON'T OPEN THE SWITCHES! Taking apart and reassembling NMB switches is a dark art of the Orient that takes years to master. I plan on taking my 3 faulty NMB boards, removing ALL the switches (without taking them apart!!!), and then building back 1 or 2 working NMB boards.
Oh, and whatever you do, DON'T OPEN THE SWITCHES!!!
