Should i buy a phantom 3 professional?

I already own a phantom 2 with a zenmuse gimbal and gopro hero 3+, but am considering purchasing a phantom 3 professional to upgrade. If i don't get a phantom 3 pro, i am considering getting a gopro hero 4. *key fact, i have $500 to spend on either a gopro hero 4 or my neighbor's phantom 3.

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