I had to make an account to comment on the thread since it really has been bothering me the last couple of times I've flown it. I have noticed a consistent +-20 knots of airspeed fluctuation on climb, and altitude select is +-300 feet when leveling out. With that, you can't really fly the airplane on VATSIM since you'll easily accelerate to 280 knots before the autopilot trims and will blow through altitudes. It is really frustrating because the Tristar is such an iconic airplane and the model is great, but the autopilot is borderline unusable.