I suspect that a lot of people already know about it, but there is a X-Star thread at rcgroups.com. It was where I learned that B&H was selling the Premium for $674, while doing research on the X-Star after I saw it at Amazon. OFFICIAL Autel Robotics X -Star series of Mutli-Rotor craft. It's not really an "OFFICIAL" thread, but there is a lot of information there. I posted a link to this forum there today.