I just bought an Apple B/T mouse with my new 20in imac and am a more than a little disappointed by it - it tends to over shoot the mark when pointing. Initially I thought it was me; that I needed to adjust to it's weight etc as it is significantly heavier than the ordinary apple mouse, but my mate (a logitech user) had a go last night and he confirmed the mouse definitely has got a mind of it's own. Is my mouse broken or is this a common complaint?