I use Emacs for C++ and I've tried a wide variety of auto complete packages, never really getting them to work properly. And the result is that Ive learned that I can be just as productive without auto complete as I was with it. In fact, I might even be more insightful into what I'm working on, because instead of relying on a pop-up menu for an API, I actually have to look at API documentation and properly learn it that way , which usually gives me much more knowledge about what I'm trying to do