Ben, they do make the high pitched whine. This is a short hop in the backyard to test firmware from a few weeks ago, I left the motor/esc sound in on this so you can hear them. I had them on the medium timing setting. 40amp esc plush.
http://www.youtube.com/watch?v=5_jRLNc0x5Q&feature=g-upl
http://www.youtube.com/watch?v=5_jRLNc0x5Q&feature=g-upl
Do those make the high pitched noise that the Turnigy ESCs make? The Castle ESCs don't scream, and that's one thing that makes me lean towards trying them on my next build.