Although obvious, I put this here first because this is one of the most important factors when purchasing your camera. The HERO3 has three editions (white, silver and black), ranging from $199 - $399 (prices continue to drop annually as newer versions are released -- we'll keep you updated on those). The HERO2's are at the bottom of this gap, but aren't as "new" and lack some features the 3's have (they're discontinued at this point but can be found on the net here and there).
Now that you've considered the features of the GoPro cameras and if the price is worth the activities you will be using it for, it is time to figure out which edition you need. The White and Silvers come in only one, so you will have to purchase specific mounts/parts you will need separately (do the math, the Black Editions with the mounts you need & WiFi accessories are a financially smart to purchase instead of a cheaper cam and everything else separately if that's what you may be doing).
Much like Band-Aids or Kleenex, GoPro makes products so good that their brand name is synonymous with the product itself. GoPro’s portable video cameras set the standard for action cameras: they’re durable enough to withstand just about any outdoor activity, they’re easy enough for anyone to use, and they include features typically reserved for far pricier cameras.
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Sign up for a cloud-based service. All GoPro cameras are set up to transfer photo and video files to your computer or smartphone, but if you’re serious about backing up your content, consider subscribing to a cloud-based backup service. Cloud-based services, such as GoPro Plus, safely keep copies of your media files and allow you to access them from other devices as needed, which can be a lot more convenient than carrying all of your content around with you on your phone.