Nice bit of spin from GoPro.

If you read the DMCA takedown, you'll see that it refers specifically to the URL of the review, not to any other URL, and certainly not to the location of any product sold on any e-commerce site.

In fact, their e-commerce site still contains GoPro products. http://www.digitalrev.com/search?t=pro&q=gopro

In short, either GoPro are lying through their teeth, or their legal team engaged in a monumental cock-up. In either case, this looks like a clear-cut misuse of the DMCA, a claim that can easily be supported by GoPro's own words, if you take them at face value. I don't.