A buddy and I just released our Workout Timer app!! We've had the Beta in the Android store for quite a while now, and it has had over 5,000 downloads! It's the 19th search result when searching for "Workout Timer" (which is pretty good considering there are over 1,000 results)!
We've upgraded almost everything, and it feels like a professional timer app. I'm very proud of the work I've done here, and if need a good workout companion app, or would otherwise like to check it out, here's the link
Download on Google Play
We also have a demo version out as well, if you want to try before you buy
Let me know what you think of the App, and if you run in to any bugs!