I've been using stevia for a couple of years now but very minimally. I might put it into tea or oatmeal and I've also tried it a a few simple recipes like banana bread and oatmeal protein bars. Other then that, I've not really tried very hard to use it as a substitute.
I made a fresh batch of banana bread tonight and replaced the the sugar with stevia. I just sampled it.....not bad. It does taste a little different but Stevia itself has a sweet but not sugar sweet taste to it. It's hard to explain. I guess it's no different then the difference in taste when you use artificial sweetener.
I found this web-site about substituting stevia in recipes. I'm thinking I might try a substitution a month....probably the same recipe several times in one month until I get it to the point the Hubs and I like. I'll share my results!