I've been in Karate for probably 8 years now. I don't train too often, so I'm only at blue belt level right now (white, yellow, orange, green, blue, brown, black, Dan levels), but my Sensei wants to test me for brown by the end of June. I've got an interest in other Martial Arts, but I can't be paying for several monthly cost at the same time. I'd like to take Aikido, but it's not possible right now.
As for using it in a fight, no. However, my friends do regularily attempt to beat on me for fun, but I'm usually able to block their feeble attacks.