I thought game SFX tools were doomed to have terrible UX, until I discovered this one! While it provides the same great features than sfxr (and its successors), it presents them in a so much cleaner interface! I'm truly amazed how organized and intuitive this is. Not only it is pleasant to use (even pretty fun), I actually understand better some of the effects thanks to their visualizations! And it should be said: it looks really great too!
Kudos for this impressive design. This becomes immediately one of my bookmarked software for creating sounds.