It's a "moneysink" not a feature. They've in the free android version, you earn a couple free w/ stars(to get you hooked), but they really want you to pay real money for additional Falcons. You're not missing out.
Yes lots of stability/performance improvements, but most importantly they did fix the standby/sleep issue. The surface will now continue to play/stream music after the screen shuts off. Now it can be used like any other music playing device