User blog comment:A Lonely Nomad/New Black Ops updates, super awesome!/@comment-24.16.50.34-20101208000433/@comment-24.16.50.34-20101208004000

That's your problem there, you only SEE the RC-XD when it's close; if you have your audio settings adjusted properly, you can hear the RC quite a ways away. And as for the weapon switch delay, I usually switch before I see the RC if the announcer says "Enemy RC-XD spotted in your area!" or if I hear the distinct sound of an RC moving.