I bought a Contour +2 a couple years ago. Debated between it and a Hero 3 Black (was no Hero 4 back then). Back then it was about $100 cheaper than the Hero 3 Black, and the reviews I read put them pretty much neck and neck with the GoPro outperforming by a hair at max resolution.
Considering I never plan to use them at their max capability (probably more like 480p or 720p), I decided to save myself $100 and get the Contour.
Unfortunately I've never really gotten a good opportunity to use it. I have it here though if you wanted to try it out. I have a cheapo external mic I bought for it as well to hopefully help with wind noise.
Couple things I found worth noting when I compared it to the Hero 3 black back in the day. Some of these however may not apply anymore with the newer Hero 4, but figured I'd share anyway.
- It has a Bluetooth based app for remote controlling. Similar to the Hero 3 but the Hero 3 is WiFi which is slower. Also the Contour App was praised as being more user friendly
- Has a built in laser leveling tool to help set it up level.
- The lense can be rotated to assist in a level picture.
http://www.amazon.com/Unknown-1701-C...dp_ob_title_ce