Is it worth it? they are really expensive, so idk if I should get one
Meh, I mean not really, but if you're so set on getting one by all means, it's not like its a bad alternative.
Which edition should I get?
Either hero3 black or hero3+
how durable are they eg will they survive being thrown around?
They are built to be durable. YOU WILL NOT BREAK THESE WHILE IT IS IN THE CASE. End of story
Anything else I should know?
consider investing in an iglide by glidecam.... I think they are $129 and they are great, they are made for smaller cameras and they add something that no other gopro edits have. smooth footage.
Also maybe consider buying a cheap external mic and a recorder then syncing the audio (I don't recommend putting the mic into the gopro because it makes it not waterproof).
What it is.