Gosh, I use this all the time for quick-breads that call for at least some baking powder.
It makes great corn bread and French Yogurt cake and banana bread and beer batter bread. I have not tried it with baking soda only recipes though. It might have too much leavening for cookies, although I may have used it for the pumpkin chocolate chip cookies, which are on the cakey side. I always cut the salt in the recipe if using self rising flour.