The PTZOptics 12x-SDI Gen 2 boasts of having broadcast features (Visca/Pelco, SDI, low-light capabilities, etc) and compares itself to professional camera models, but it is NOT a professional broadcast product.
Perhaps the abundance of features is why some are rough around the edges or not fully implemented -- framerate options don't include broadcast speeds, UDP commands are similar to but not visca compatible, video delay is long, minimum incremental movement is quite large.
The price can't be beat! If you can afford it, it is worth having for the situations that can work within those specs.
I won't be returning mine, but it won't be used on live productions.