GoPro is interesting. I've owned every one of their models and had some very negative experiences due to performance shortcomings associated with product engineering. As for warranty support, they're quite evasive.
GoPro is as much marketing company as it is a video camera company. Their marketing is better than the camera even though the images the camera can capture are sometimes spectacular. That works with today's consumer.
I don't know actual numbers but I'd speculate that GoPro's market share is greater than Apple's iPhone. GoPro's market penetration is pretty impressive as is their client list.
Many think the iPhone is the ultimate, but to myself they have numerous performance shortcomings and are extremely over priced compared to their competition yet they sell like hotcakes and every up and coming consumer wants one. I imagine similar can be said for GoPro. Both companies have substantial global recognition.
It will be interesting to watch the stock performance.....so far it's a flatliner. Considering the market conditions since IPO flat isn't that bad........IMO.