Nice price if you want a more value action camera.
As far as comparisons go, so much more than just accessories in the box and on paper technical specs. Look at low light recording, whether you get shutter roll, mic recording quality. Even a paper comparison exercise highlights some pretty big differences. GoPro Hero 3 Black will do 1080p at 60fps, Rollei only 30fps.
GoPro are the established name, and you will pay a little bit of a premium for that, but you are absolutely kidding yourself if you think you can pay significantly less for exactly the same.
Andrew Moore - Your opening post just tends to slate GoPro. Just because you sell a competing product? If you want to sell these as Gopros for less than get out there with the models you are selling and do an actual side by side comparison to a GoPro Black. Instead of just singing the virtues of this product as an equal standing option show people as such. Sounds like you have used a Hero 2 previously...not good enough - The Hero 3 Black is OBNOXIOUSLY better than it's predecessors.