CoolP:
The behavior described by Balus exists.

I use the Saitek panels and throttle. Yoke and pedals are ChProducts. It happens on occasions when trimming the airplane, and usually occurs within between 0 and 1500 ft.  rate of climb, negative or positive. If I continue rotating the trim wheel (Saitek wheel or the 707 AP pitch trim wheels) the oscillations dampen and eventually cease. Rotating the wheels in the opposite direction may induce the oscillations again. I have not been able to associate it with any particular flight or flying conditions. Weight and balance do not seem to be a factor. A saved flight may do it on some occasions and not on others.

The problem occurs with the original Saitek drivers as well as with the SPAD beta drivers.

Windows 7, 36 bit