I've had the G940 since November but have had trouble with spiking in the rudders; it took until last week for Logitech support to cop to the defect and allow me to send it back in for repairs. Only the joystick pots are the expensive, Hall sensors - the rudder and throttle are still cheap pots. I liked the split throttle and the FFB was insane - first time I was hit by enemy fire while flying, the FFB reaction practically jerked the joystick from my hand. I dialed FFB down after that but it felt very authentic.
All said, I wouldn't buy it again, though. Logitech's product support is appalling.