I bought this for playing IL2-1942, but after a short time, I noticed the calibration used to *float*, which I've now heard more and more is a common issue. The stick seems to uncalibrate itself, so mid-game, will keep pulling up, meaning I have to almost push the stick fully forward just to keep the plane straight. Calibration in Control Panel confirms this when it happens, then it will return to normal.
I did try opening the product and made sure all Y axis connections / earthing was secure, worked for a little but now back to usual playing up. I've reinstalled all latest drivers, but it still remains unstable. Saying this, a friend of mine bought the same product around the same time as me and hasn't experienced a problem. A lot of specific IL2 forums do highlight the issue however, which is a shame because it's great looking and comfortable!