I'm not sure, but were you around in the early WP7 days over 2 years ago?
In those days 3rd party clients for YouTube were a joke compared to what we have on WP today. One app, i.e. LazyTube, wasn't particularly pretty nor functional, it had to launch YouTube videos through the browser. However, over the course of a few months the amazing developers at LazyWorm brought the YouTube client's functions up to par with Google's official YouTube apps on iOS and Android. In some respects, this 3rd party client was better than Google's official apps. The app I am talking about is none other than MetroTube
Instance is still a version 1.0 product, though a damn good one compared to the way MetroTube and others started out. Rudy did an awesome job and I am excited to see how he will evolve and further develop the app, exciting times ahead.
Also, having seen LazyWorm and other developers (e.g. Davide Bergamini, Seles Games, Liquid Daffodil and WPC's own Jay Bennet) grew their apps over the past couple of years on WP is probably the reason why I am sticking with this platform. It's just amazing to see these people contribute in such amazing and unique ways, so kudos to all of them, especially Rudy for a great showing with Instance!