Hit a case of a bad out-of-box failure on my RTB2004 (COM4 bundle at the promo price from Newark, last one in stock last week).
Effectively, the vertical system .. doesn't work. At all. Full span noise at every vertical setting. And then Channels 1-3 stopped display anything, and the UI had multi-second lag when they were enabled, leaving channel 4 as the only noise generator.
On the upside, even though it was past business hours on Friday when I sent in the support e-mail, I got a response phone call back in minutes. Sadly the front-line tech wasn't able to diagnose much other than "it sounds broken" but they'll follow up Monday. Hoping for a faster exchange option compared to returning it to Newark.