I have been playing and DMing D&D for a long time (the basic red box through current, with the exception of 4th Ed.--who can blame me for that). 5E is developing great and I'm having a lot of fun with it. I've gotten to that stage in my gaming that it was time to take off the training wheels as a DM and delve into complete original writing, so that's what I'm doing now: completely original world, all original adventures, and all original materials. I'm not allowing myself to use any prepackaged modules, scenarios, or campaign world material. It's turning out to be a lot of work, but also a lot of fun: and the players are having a blast.