I have not encountered any problems with stability: once pegged to the table, you really "go" to take off the joystick from the surface. (Tested with Flight Simulator X.) The design does not seem extraordinary to me, but it's really a minor point compared to the rest. The lack of force feedback is not detrimental either.
In summary, Logitech is once again true to its reputation by delivering a joystick with an excellent value for a rather specialized use. You can also use it for other games, as the programmable buttons can adapt to many uses. A purchase to recommend!
(And bonus for users of Apple: it's Mac compatible (Not able to test on Mac, for me)!).