Just got my Flieger no-logo w/ COSC movement (2824-2) a couple days ago. The movement definitely looks more refined than the standard grade ETA in my Hamilton Khaki, but there's a very clear difference in how the rotors spin.
The "German silver" rotor in my Stowa seems to be a little "sticky". By that I mean that the rotor only spins if the watch itself is rotated enough (say, 30-45 degrees). If I slowly rotate my watch, the rotor will stay put until it reaches a certain threshhold, and then it'll quickly "drop" to the lowest point (gravity). In contrast, the rotor in my Hamilton moves extremely freely. If I slowly rotate the watch, the rotor will rotate in the opposite direction along with it. It is always at the lowest point. If I suddently spin my watch, the rotor will move in a pendulum-like (back-and-forth) motion because there is almost no friction.
Why is there such a difference between the movements? They're both ETA 2824-2. The only difference I can tell besides the different grades are that the Stowa has perlage decoration and a different rotor, but I can't imagine these things affecting its rotation. Accuracy is OK (+7 sec/24 hrs, which is a little higher than a COSC movement should be), but I haven't been able to check power reserve after wearing it yet. Hopefully it won't be diminished too much due to lack of adequate rotor spinning.