In my case, it's my connection to the server being slow (56k) and these people with faster computers are choking my connection, so my movements are choppy, perhaps allowing me to steal a frag or flag without being seen since they do not have the packets sent fast enough. Yes, a lag cloak is cheating in a duel, but if you are in a CTF server with 13 people and1 person cheating, it should not be a problem...right?

I think that a Lag cloak by their connection is fine, but any programs used for this is cheating. That's just my opinion.