I agree with Richard. Winders are mainly for convenience. They probably won't hurt your watch much, and probably won't really help much either as long as your movement is properly serviced.
As for the 7750, the one that comes in the IWC is the higher quiality asian copy if I am not mistaken. My advice is just to minimize use of the chronos and don't set the date between 10pm and 2am. It should hold up fine with normal use.
Hope that helps!