I had an Extreme 3D Pro also. It has a super-good form, very good sturdy base and kick-ass button layout, but it burned itself out in about 6 months or so. It started having anomalous axis behaviour - rudder stopped working properly, and so did the Y-axis... After plugging it in it calibrated just fine, but after using it a few minutes something alwaysd happened to it, making the elevator only turn a few degrees when I pulled the stick all the way backwards - ie. the Y-axis only worked on small portion. Same happened to rudder's right half - when I twisted the stick to right, the rudder - or, in control panel, the axis indicator - only moved a short way and then stopped there.
Crappy electronics it had, I bet. Monday piece... if you notice anything like this on your Logitechs, return it immediately. I thought it was my computer (hey, I was younger that time and didn't know better) and didn't return the stick, and now I have an unusable Extreme 3D Pro stick here.
Though, it still has one good axis - throttle. I sometimes plug it on and use the throttle lever as elevator trim in IL-2 Sturmovik:FB...