I also cut down on sugar in recipes when possible, it doesn't make a great differance to the the finshed taste.
I use the Splenda/sugar blends, both white and brown. The blends substitute 50% to 1 so if a recipe calls for a cup of sugar, one uses half, therefore the finished item has only 1/4 the sugar of the original. Great for diabetics like me. Or for people on restricted sugar diets.
I have baked numerous cookies, cakes, quick breads, pies and so on and the ratio works out beautifully. In fact, although it seems to go against traditional ideas, recipes using only half the amount of sugar, to the full amount of butter or shortening, actually spread less than in the original recipe. I like this trait as I can get more cookies on a baking sheet. I flatten them with the bottom of a glass to avoid having compact dome-shaped cookies.