G'day John,
I owned a 150mm Synta F/8 for a few years (sold it last year during a clean out). In some ways the best mount I ever had it on was my car! Place a bean bag on the roof of the car and the scope on top of that. Only good for objects at lower altitudes but I defy you to find another motorized mount with as much torque
The big Synta was too much scope for any real mount I had or wanted to lug around so it was sold. Very much
not a grab and go scope as you said.