So far most of our feedback is users emailing us - which has its limitations, but we've got a pretty active and vocal base right now. I'd love to do A/B testing in the future, but we're limited by resources right now. It's been more important to roll out new features than do intense refinement.

I can definitely empathize with the annoyance of having to play musical tabs.. I'm going to be giving this aspect some serious thought in the coming weeks.

Great link to the muxtape story - thank you for that.