GoPro: Video Transfer from computer to iPhone
 

I usually use Dropbox to transfer my videos from my PC to my iPhone and it works fine but it takes the quality out of my videos. I record in 1080 but it looks a lot more blurry than it does on my computer when it's on my iPhone...is there a better way to transfer the videos? I use the GoPro Hero 3: Black Edition.

May not help entirely but if you upload to Vimeo you can download directly off the site to your phone with minimal quality loss.

If I'm using the video from my GoPro for something like instagram where the quality really only needs to be good enough for a phone then I will use the GoPro Studio software to export the video with the choice for iPhone. (At the moment I'm not sure if it says mobile/iPhone/etc but it should be easy to find once you edit & export).

As far as a full quality video I've used Google Drive before and it worked well although the video could of course take quite a while to upload.