I use zooms primarily and fine tuning is too limited to be useful for the zoom lenses. Until they make different tuning settings based on focal length, I'm not going to use it. I've found that tuning for one focal length messes up others. And if you do a drastic enough adjustment, you'll throw off your focus at infinity since the test targets are typically much closer to the close focus limit.
As far as I know, only the big gun Canon bodies can track AF fine tune based on multiple focal lengths on a single lens.