I have used D76/ID11 for as long as I've developed film because it works. If I'm not happy with my photographs I do not go looking for a magic chemical bullet. A weak image in D76 is also a weak image in Pyro, or anything else. I think there's much more to gain by improving ones metering, putting the subject and the the edges where they belong, and learning to print effectively than by dabbling with new to you developers. Once you've 'learned' a developer, stick with it and be as consistent as possible.