Hello,
Thanks for watching. Check out other videos on my YouTube channel for lots of videos filmed with a Phantom 2 for a comparison. Basically this is what it boils down to... If you need/want to shoot 4K, the Phantom 2 will not work for you. You CAN shoot 4K on a GoPro, but it doesn't look that good(wide angle) and you end up with props in the shot every time you fly forward. If you're happy to shoot at 2.7K medium, a Phantom is a great kit. I personally own both right now and I can tell you that the Inspire camera looks better 90% of the time. Having camera controls on the ground is also essential if you're serious about getting high quality video.
There are people here who would argue with me, I'm sure. But, watch one of my videos shot on a phantom, then watch the Inspire video and compare. The overall production value of the Inspire's video is better.
As for backpacking, no one has a backpack case for the Inspire... Yet. It will come though, I'm sure. you could easily strap it to the outside of a decent pack though and transport it that way. I've also seen people get straps for the hard care that turn it into a backpack.