Buttons are easy enough to work with, same with levers. Dials were hard though because the normal human behavior is to pinch a dial, but in VR, you can only really grab, and knowing where exactly the game will deal with your grab on a small dial is tricky, especially if it's an autopilot dial with nested dials.

It'd probably work better if I had a VR system that had hand detection rather than needing controllers.