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If you can wait until hero 4 comes out it will be pretty much twice as good as hero 3 black... however it might cost more than hero 3, especially since those are on sale. It is difficult to know when 4 model is coming out but specs on it are insane. A9 chip allows 240fps at 720 and 120fps at 1080.
My projection is that hero 4 will be announced in mid october and starts to hit stores/ship around mid november.
Sounds great. Where did they release the specs ?