Betson ordered the KT-2914F and KT-2914DF (which one you get from Betson varies with when it was sold originally - new ones, if they still have them, should be the DF) without the rotate circuitry. The factory literally just left it off. Hence, the option is still there in the menu, but it doesn't do anything.
If it's badly rotate, you can still manually correct by rotating the yoke (or just return the thing to Betson). Slight issues are, well, slight and hopefully don't need correction.
The focus control on the flyback works just fine. All the other OSD options seem to do something sensible in both user and service mode.
There are some issues with horizontal non-linearity (aka "side compression") in CGA modes. It's apparently worse on the DF than the F models. I have an F model, and it's there but slight. With some careful adjustment, I was able to make it really only visible on a grid pattern and occasionally on certain side scrollers, but it's not objectionable. The problem doesn't seem to exist on EGA, VGA, or SVGA modes.