For once, I got the cloak and dagger to work today. I don't know if it really helped my team (we won on defense on the final point of cashworks maybe after a short overtime, but that's no big accomplishment), but I managed to get back up to the other team's spawn point, and just camped there while invisible. I harassed the engineer or two who built entrances, and though they repaired it a few times before I could destroy it, it was pretty entertaining. One sniper (Volcynika?) kept running out and just standing still looking around...it was very scary how close they came to getting me. :lol
I did the sap+shoot three times thing to kill it once, also. I guess it works pretty well if you have time to do it.